2021–2024: Career beginnings Boose adopted the stage name Sombr upon the release of his debut single, explaining that the name incorporated his initials (SMB) and reflected his emotional state at the time. In early 2023, following the virality of his fourth single "Caroline" (2022), Sombr signed a record deal with
Warner Records and released "Weak", his first single with the record label. In September 2023, he released his debut EP,
In Another Life, co-produced by
Tony Berg.
2025–present: Breakthrough and I Barely Know Her In March 2025, Sombr earned widespread attention when two of his songs "
Back to Friends" and "
Undressed" gained popularity after going viral on the video-sharing app
TikTok. Additionally, "Undressed" topped the
Irish Singles Chart and entered the top five in Australia, New Zealand, and the United Kingdom. "Back to Friends" also landed within the top five in Australia, Ireland, and New Zealand. The success of both songs led to Sombr's first major award recognition, earning three nominations at the
2025 MTV Video Music Awards, including
Best New Artist, winning one for
Best Alternative Video (for "Back to Friends"). Having previously performed as a supporting act on tours for
Nessa Barrett and
Daniel Seavey, The North American and European legs began on May 25 in
Dublin and is scheduled to conclude on October 28 in
Los Angeles. It will then continue with the Australia and New Zealand legs, starting on December 2 in
Auckland and ending on December 14 in
Gold Coast. In May 2025, Sombr was featured on
Billboard's annual
21 Under 21 list. He made his live television performance debut on
The Tonight Show Starring Jimmy Fallon on May 20, performing "Back to Friends". In July, he also performed "Undressed" on
Jimmy Kimmel Live!. Additionally, he has appeared on the
Sirius XM and
Audiotree live segments, which included a cover of "
Fade Into You" by
Mazzy Star and "
Fake Plastic Trees" by
Radiohead, respectively. On June 17, 2025, Sombr announced the single "
We Never Dated", released on June 20, which became his third top-40 hit in both Ireland and the United Kingdom. The song marked another notable success for Sombr, reaching the top ten in Australia, Ireland, Sweden, and the United Kingdom, On August 11, 2025, Sombr announced his debut album,
I Barely Know Her, released on August 22, 2025, which included the aforementioned four singles. It received positive reviews from publications such as
Rolling Stone,
NME, and
Variety, and reached the top ten of severals sales charts, including the
Billboard 200 and the
UK Albums Chart. At the
68th Annual Grammy Awards Sombr was nominated for
Best New Artist. On February 6, 2026, Sombr released the single "
Homewrecker", marking the first new release since his debut album. == Artistry ==