Early career and the Bicycle Thief (1995–2001) Klinghoffer became involved in performing and recording music in Los Angeles at an early age. Klinghoffer described himself at this time as "[the] little music dork who lived around the corner, dropped out of high school, and was just playing guitar all day long." In 1997, at the age of seventeen, Klinghoffer joined
the Bicycle Thief, the then-current project from former
Thelonious Monster frontman
Bob Forrest.
Red Hot Chili Peppers vocalist
Anthony Kiedis noted that "Bob [Forrest] has always had a very keen sensibility about finding extremely talented and down-to-earth people who just want to get to a kitchen and write a song." The band's subsequent studio album,
You Come and Go Like a Pop Song, marked Klinghoffer's first recording experience. In late 1999, the Bicycle Thief opened for Red Hot Chili Peppers, as the latter toured in support of their seventh studio album,
Californication.
John Frusciante and Ataxia (2002–2004) Klinghoffer and the Red Hot Chili Peppers guitarist
John Frusciante began writing together in 2002, with the hopes of recording and releasing an album under a band name. This album was eventually released as a John Frusciante solo release in 2004, entitled
Shadows Collide with People. Regarding this decision, Frusciante stated: During the first six months of 2004, Klinghoffer continued to assist Frusciante in the studio. Klinghoffer's drums, bass, vocals, keyboards, and/or guitar can be heard on the full-length albums
The Will to Death,
Inside of Emptiness, and in 2009's
The Empyrean. 2004's
A Sphere in the Heart of Silence is also credited to both musicians, and features several tracks with Klinghoffer on vocals, lead guitar, synthesizers and sequencing. He plays drums along with Frusciante and
Fugazi bassist
Joe Lally in
Automatic Writing and
AW II, under the name
Ataxia. Frusciante commented on his relationship with Klinghoffer in 2004 stating: "He's simply a very talented person and has been a very close friend for the past four years. He's one of the very few people who I really like to spend a lot of time with. In many respects he's the person who is closest to me, and with whom I can speak honestly about everything. His opinion is very important to me and I value it a lot." A previously unreleased track, "Rewire", was also included in their digital-only 4-song
self-titled EP. Dot Hacker released a two-album series in 2014, with ''
How's Your Process? (Work) being released on July 1, 2014, and the second album, How's Your Process? (Play), being released on October 7, 2014. The band played at The Chapel, San Francisco, in July 2014 and Los Angeles in August 2014. The band announced plans to play Tokyo in February 2015 in support of the two albums. This was their first time performing outside of the United States. Dot Hacker released their third album, Nº3'', on January 20, 2017.
Red Hot Chili Peppers (2007–2019) In 2007, Klinghoffer played with Red Hot Chili Peppers on the final few legs of their
Stadium Arcadium tour, playing additional guitar, backing vocals, and keyboard parts alongside the band. His first show with the band took place on March 12, 2007, at the Cox Convention Center Arena in Oklahoma City. On May 8, 2009, amidst confusion as to whether Frusciante still remained within Red Hot Chili Peppers, Klinghoffer, Anthony Kiedis,
Flea,
Chad Smith,
Ron Wood and
Ivan Neville performed under the name the Insects at a
MusiCares benefit in honor of Kiedis's commitment to helping those struggling with addiction and recovery. bassist
Flea at
Lollapalooza Chile, 2014 In 2009, the Chili Peppers ended a two-year hiatus, and were joined by Klinghoffer in the studio to begin work on their tenth album, ''
I'm with You''. At the time, unbeknownst to the public, Frusciante had already quit the band earlier that year without announcing his departure. In January 2010, Klinghoffer performed with the band for the first time as their lead guitarist at a MusiCares tribute event to
Neil Young for a performance of Young's "
A Man Needs a Maid". It was later revealed he would permanently replace Frusciante as guitarist. Klinghoffer was officially named the replacement for John Frusciante in early 2010. Regarding his entry into the band, Klinghoffer notes, "I've always been attracted to the idea of a tight-knit unit, a band of family, a brotherhood. Since my earliest memory, they always seemed like a band with a lot of love for each other." In May 2010, Klinghoffer along with Flea performed the United States national anthem at a
Lakers home playoff game during the
NBA Western Conference finals series against the
Phoenix Suns. After eleven months of writing and rehearsing, the Chili Peppers began recording a new album, ''
I'm with You'', on September 13, 2010. Klinghoffer also sang, wrote music, played the drums and keyboard on the album. Recording was completed on March 18, 2011, and the album was released on August 29, 2011. The album's first single was "
The Adventures of Rain Dance Maggie". In 2011, Klinghoffer wrote and performed the original score for the documentary
Bob and the Monster. Klinghoffer also appears in the documentary, which is based on the life and career of musician and drug counselor Bob Forrest. Klinghoffer was said to have contributed to at least one track on former
Jane's Addiction bassist
Eric Avery's second solo album,
LIFE.TIME. (2013), although the album did not include it. On July 10, 2011, Klinghoffer appeared at the 2011 School of Rock's Rock the House Tour which also featured
Keith Morris and
Page Hamilton. Klinghoffer joined the School of Rock kids on stage to perform Red Hot Chili Peppers songs "
Dani California" and "
Give It Away". This was the first time he performed any of the Chili Peppers' songs live since officially joining the band as their guitarist. In April 2012, Klinghoffer was inducted into the
Rock and Roll Hall of Fame as a member of the Red Hot Chili Peppers at 32 years of age. This made him the youngest ever inductee until 2020, when he was surpassed by
Nine Inch Nails drummer
Ilan Rubin. In January 2015, Klinghoffer returned to the studio with the Chili Peppers to begin work on their eleventh studio album which would be produced by Gnarls Barkley's
Danger Mouse. Recording was put on hold the following month when bassist Flea suffered an injury during a skiing trip. Production resumed in August 2015 and
The Getaway was released on June 17, 2016, which was followed by an extensive
world tour that concluded in October 2017. Work on Klinghoffer's album
To Be One with You was announced in September 2018, with plans to release it sometime in 2019. However, the recording was delayed due to the
Woolsey Fire. On November 2, 2019, the band performed a charity event at the
Silverlake Conservatory of Music in Los Angeles. This would be the band's final show with Klinghoffer. On December 15, 2019, the Chili Peppers announced via an
Instagram post that Klinghoffer was parting ways with the band after ten years on good terms, and that former guitarist John Frusciante would be rejoining the band. "Josh is a beautiful musician who we respect and love. We are deeply grateful for our time with him, and the countless gifts he shared with us. We also announce, with great excitement and full hearts, that John Frusciante is rejoining our group. Thank you." the band's statement read. In an interview released on January 18, 2020, by
Ultimate Guitar, Klinghoffer spoke briefly for the first time about his departure from the band. Klinghoffer said that he couldn't go into detail about his departure but when asked if there was any hard feelings between him, the band or Frusciante he responded by saying "I don't think so. Not from me." However, in June 2022, he admitted that the friendship between him and Frusciante was "non-existent" and that they hadn't spoken in over 10 years, while maintaining that he had no hard feelings towards the rest of the band. Klinghoffer on January 23, 2020, gave an interview with
Marc Maron on the
WTF with Marc Maron podcast where, for the first time, he discussed in detail his firing from the band. Klinghoffer described the meeting with the band as being "really sweet" and that “I rode my bike over [to Flea’s house]. They just said, 'We’ll get right to it. We’ve decided to ask John to come back to the band' And I just sat there quiet for a second and I said, ‘I’m not surprised.’ And the only thing I could think to say was, ‘I wish I could have done something with you guys, musically or creatively, that would have made this an absolute impossibility.” Klinghoffer said that “It’s absolutely John’s place to be in that band. So that’s why I’m happy for him, I’m happy that he’s back with them.” The news of his firing did however come as a “complete shock but not a surprise” as he had known Frusciante had been jamming with Flea in recent months and that Anthony Kiedis was also recently in contact with him. “John and Flea have a musical language. I’ll never be able to contend with the history him and John had.” Klinghoffer also discussed Frusciante's departure in 2009 saying “We had been friends and working together. When they decided they wanted to carry on and he maintained he was sort of done with it, and they asked me to do it, I think he was really surprised that they were going to carry on without him… It was sort of a strange position I was holding.” Klinghoffer maintained that he was fine with the decision and there was "no animosity" between him and the band. “If John coming back had happened five years ago, it would have been hard for me, temporally, to weigh [my contributions] against what they had. Now, after 10 years, two tours, and almost three albums of writing, I’m really proud of what I did with them. I feel like we did create something.” On January 31, 2020, Klinghoffer was interviewed by
Rolling Stone and opened up much more about his firing. Klinghoffer said "I love those guys deeply. I never saw myself as deserving to be there over John." He further discussed the moments when he found out he was being fired saying "It was mostly Flea talking. Anthony didn’t say much. But I can see in his eyes that it was a very painful decision. And I think of Anthony as a very tender and supportive person. We all hugged and Chad texted me before I even got home. He was really heartbroken about the whole thing because Chad and I are very good friends." Klinghoffer said that he was unaware of the band's statement on his firing and said "I was totally surprised. And it does look exactly like a death announcement." Klinghoffer also discussed the two albums he recorded while in the band saying "I’m not particularly fond of the two records. I liked the songs and I think we wrote some really cool songs together, but I’m such a pain in the ass. Rick Rubin was the producer [on
I’m With You]. And the reason why I didn’t want to work with him the second time [the band was in talks for Rubin to produce the new album] was because I felt like those four had a relationship and I was the odd man out."
As Pluralone (2019–present) On August 16, 2019, Klinghoffer released his first solo single "Io Sono Quel Che Sono B/W Menina Mulher Da Pele Preta" under the name Pluralone. The single was made available on vinyl on August 30, 2019. The album featured two covers of non-English songs; "Io Sono Quel Che Sono" is a cover of Italian singer
Mina, and "Menina Mulher Da Pele Preta" is by Brazilian singer
Jorge Ben. Klinghoffer performed all instruments and vocals across these two tracks, with album art by Dot Hacker partner Eric Gardner. Klinghoffer released a follow-up album titled
To Be One with You on November 22, 2019, under the name
Pluralone. The album features guest appearances from Flea and Red Hot Chili Peppers alum
Jack Irons. Members of Klinghoffer's band Dot Hacker also appeared along with former Jane's Addiction bassist Eric Avery. On September 22, 2020, the release of his second album as Pluralone, ''
I Don't Feel Well'', was announced; as a preview the song "The Night Won't Scare Me" was released on digital platforms. The album will be released in vinyl (with a limited edition gold vinyl), CD and digital. On January 26, 2022, the release of his third studio album,
This Is the Show, was announced, with the first single "Claw Your Way Out" coming to digital outlets that day. The album was released on black vinyl, clear colour vinyl, CD, and digital. Additional singles for "Offend" and "Fight For The Soul" were released with videos. On March 25, 2026, Klinghoffer released the single "I Hope You Knew", his first release in 4 years. The song was released on digital platforms
Pearl Jam (2020–present) On January 21, 2020, Pearl Jam announced Klinghoffer, under the Pluralone name, was set to "support Pearl Jam on the Spring 2020 tour dates", before the band announced the tour postponement in March. Klinghoffer made his debut with Pearl Jam as a multi-instrumentalist touring musician once the band resumed performing live at the Sea.Hear.Now Festival on September 18, 2021. His involvement with the band was aimed particularly to help flesh out the live versions of songs from Pearl Jam's new album
Gigaton. He also performed in the recordings of
Eddie Vedder’s album
Earthling and as a member of Vedder’s backing band, the Earthlings, at The Ohana Festival in Dana Point, CA, and toured with them in February 2022. Josh also filled in as Pearl Jam's drummer on September 13, 2023 when the band's drummer
Matt Cameron could not perform due to contracting COVID-19.
Current and upcoming projects and session work Klinghoffer appears on seven songs on
Iggy Pop's 2022 album,
Every Loser. He also co-wrote two songs on the album. To promote the album, Klinghoffer will be part of Pop's backing band called the Losers which consists of his former Red Hot Chili Peppers bandmate,
Chad Smith,
Duff McKagan and
Andrew Watt. Klinghoffer, Chad Smith, and Flea collaborated with
Morrissey on his upcoming album
Bonfire of Teenagers, which was supposed to be released in February 2023, but in December 2022 it was announced that its future is in limbo, as
Capitol Records has decided not to release it. After making guest appearances with the group in 2022, Klinghoffer was announced as the touring guitarist for Jane's Addiction in 2023, filling in for longtime member
Dave Navarro (coincidentally a former member of Red Hot Chili Peppers himself), who was ill with
long COVID. Navarro returned to the band for its 2024 European shows, with Klinghoffer receiving a writing credit on the band's single 2024 single, "True Love", which he had performed live with the band during his touring tenure. After producing and performing on
Redd Kross's self-titled 2024 album, Klinghoffer and his former Red Hot Chili Peppers bandmate Chad Smith featured as the backing band on
Elton John and
Brandi Carlile's forthcoming 2025 studio album,
Who Believes in Angels?. Klinghoffer and Smith also joined John and Carlile for their special television concert
An Evening with Elton John and Brandi Carlile that aired on
CBS on April 6, 2025. ==Legal issues==