On April 9, 1965, Johnston joined the Beach Boys in New Orleans, filling in for
Glen Campbell, who briefly served as a touring member for
Brian Wilson, and had declined an offer to officially join the band. Campbell played his last show as a Beach Boy on May 15, 1965 and Johnston then became a full-time replacement for Brian Wilson on the road. Johnston did not start playing bass until his first tenure with the Beach Boys. The first contributions he made to recordings as one of the Beach Boys was on
Summer Days (And Summer Nights!!). For contractual reasons, however, he was not credited on a Beach Boys album cover until
Wild Honey (1967) though he was photographed as a touring band member on the back sleeve of
Pet Sounds (1966). In May 1966, Johnston flew to London and played
Pet Sounds (1966) for
John Lennon,
Paul McCartney, and
Keith Moon. He had provided backing vocals to six of the album's 13 tracks: "
Wouldn't It Be Nice", "
You Still Believe in Me",
"That's Not Me", "
God Only Knows" (also co-lead), "
Sloop John B", and "
I Just Wasn't Made for These Times". He similarly contributed backing vocals to some of the subsequent
Smile sessions. In early 1967, Wilson discussed the extent of his personal relationship with Johnston to
Melody Maker: "I'm afraid I only know Bruce superficially. [...] I only see him at recording sessions. [...] He's a very likeable person." Johnston did not participate in most of the 1967
Smiley Smile sessions and played on only a few tracks on
Wild Honey. Reflecting on
Smiley Smile, Johnston said it was "a thousand times better than the [original
Smile] [...] It's just the most underrated album in the whole catalog for me." The Beach Boys asked touring member
Billy Hinsche to permanently replace Johnston in mid-1969, although Hinsche elected to focus on his studies at
UCLA and Johnston was not aware of the offer at the time. Starting with the instrumental "The Nearest Faraway Place" from
20/20 (1969), Johnston's original compositions began appearing on the band's records. Johnston considered his favorite Beach Boys album to be
Sunflower (1970). In a 1970s interview, he described it as the last true Beach Boys album because, in his belief, it was the last to feature Wilson's input and active involvement. He nonetheless regretted the inclusion of his two songs, saying that "
Tears in the Morning" was "too pop" and that "I wish I hadn't recorded ['
Deirdre'] with the group." ''
Surf's Up'' (1971) included Johnston's most notable written composition for the band, "
Disney Girls (1957)", which was subsequently recorded by, among others,
Cass Elliot,
Captain & Tennille,
Art Garfunkel,
Jack Jones, and
Doris Day. From a performance standpoint, he later cited 1971 as his favorite year of the group musically because their set lists focused on newer songs. He also criticized ''Surf's Up'' as "a hyped-up lie." His final contribution before departing consisted of backing vocals on their 1972 song "
Marcella". In 1972, Johnston was fired by the Beach Boys; manager
Jack Rieley said he dismissed Johnston at the request of the Wilson brothers. Brian told an interviewer, "All I know is he got into a horrible fight with Jack Rieley. Some dispute, and they got into a horrible fight, and the next day Bruce was gone."
Dennis Wilson said, "There's less tension since Bruce left. [...] Musically, we didn't click [and] appreciate each other, so one day we both said, 'OK, that's it.' He's a good guy but he was writing stuff for a solo album. [...] We're a band." Mike Love stated, "It was very amicable. The Beach Boys never threw him out. He was just on a tangent that was outside The Beach Boys for so many years." Johnston himself said that he quit the band partly due to his unhappiness with Brian's creative withdrawal from the group. Later, in 1974, he said that he departed because he "didn't want to go on singing oldies for the rest of my life" and was "too frustrated being [considered as] a fifth of something – which was what I was with the Beach Boys." ==Solo career and return to the Beach Boys==