- X (Los Angeles punk rock band)
- X (Australian punk band)
- X (Japanese rock band, changed name for X JAPAN in 1992-08)
- X (Australian speedcore project)
- X - Tram
- X Alfonso (Cuban hip hop and afro-rock musician)
- X Ambassadors
- X Ambassadors & Commons, Jamie N
- X Ambassadors & Commons, Jamie N featuring JAY‐Z
- X Ambassadors & Knocks, The
- X Ambassadors & Medium Build
- X Ambassadors & Morello, Tom
- X Ambassadors & OurVinyl
- X Ambassadors & ROBI
- X Ambassadors feat. Commons, Jamie N
- X Ambassadors feat. Commons, Jamie N & ASAP Ferg
- X Ambassadors feat. Imagine Dragons
- X Ambassadors feat. JAY Z
- X Ambassadors feat. K.Flay
- X Ambassadors, Drake, Rowan & SAINT KID
- X Ambassadors, K.Flay & grandson
- X Brothers, The (with Joe Bouchard)
- X CLUB. (Australian duo Ben Clarke & Jesse Morath)
- X Contract (Danish 2010's hard rock group)
- X Dinero
- X Dirty Fingers
- X Factor Finalists 2008, The
- X Factor Finalists 2009, The
- X Factor Finalists 2010, The
- X Factor Finalists 2012, The
- X Fears (Brazilian Prog Metal band)
- X JAPAN (named “X” until 1992-08-24)
- X Juno (solo project of Zach Urch from Honey Moon)
- X Lovers
- X Lovers ft. Moriondo, Chloe
- X Makeena
- X Marks the Pedwalk
- X Models
- X SMILE (ID music producer)
- X-103
- X-BORDER
- X-Cess
- X-Clan
- X-Clan feat. Chali 2na
- X-CNN
- X-Coast
- X-Cops
- X-Core
- X-Divide
- X-Dream (German goa trance/psy-trance/techno group)
- X-Ecutioners feat. Coleman, Anikke
- X-Ecutioners feat. Everlast
- X-Ecutioners feat. Large Professor
- X-Ecutioners feat. Start Trouble
- X-Ecutioners feat. Tom Tom Club & Biz Markie
- X-Factor All Star
- X-FIR3 & Jaz EK
- X-Fusion
- X-Killer
- X-Legged Sally (Belgian 90ties jazzrock band)
- X-Maleya
- X-Man (Martinique (FRA) dancehall singer)
- X-Mary
- X-Mas Project
- X-Men (French Rapper)
- X-Men, The (UK band on Creation records)
- X-Mob
- X-Noize (Psytrance duo from Israel)
- X-O-Planet
- X-One (Italian italodance project)
- X-Pander (Valentin Troha, hardstyle)
- X-Patriate
- X-Press
- X-Press 2 feat. Byrne, David
- X-Press 2 feat. Wagner, Kurt
- X-Quisite
- X-Raided feat. Brotha Lynch Hung & Sicx
- X-Raided feat. Kingpen & T-Nutty
- X-Rated, DJ
- X-Ray (Swedish pop)
- X-Ray Dog (production music library [XRCD#])
- X-Ray Love
- X-Ray Pop
- X-Rx (electronic dance music group)
- X-Samar
- X-Scape (Belgian trance duo)
- X-Score (composer team)
- X-Session (Belgian dance/pop act)
- X-Sinner
- X-Sonic
