- X (Los Angeles punk rock band)
- X (Australian punk band)
- X (Japanese rock band, changed name for X JAPAN in 1992-08)
- X Alfonso (Cuban hip hop and afro-rock musician)
- X Ambassadors
- X Ambassadors & Commons, Jamie N
- X Ambassadors & Morello, Tom
- 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 Brothers, The (with Joe Bouchard)
- X CLUB. (dance music)
- X Contract (Danish 2010's hard rock group)
- 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 Lovers
- X Makeena
- X Marks the Pedwalk
- X Models
- X-103
- X-Cess
- X-Clan
- X-Clan feat. Chali 2na
- 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-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-Noize (Psytrance duo from Israel)
- X-O-Planet
- X-Patriate
- X-Press
- X-Press 2 feat. Byrne, David
- X-Press 2 feat. Harvey, Rob
- X-Press 2 feat. Wagner, Kurt
- X-Quisite
- X-Raided feat. Brotha Lynch Hung & Sicx
- X-Rated
- X-Ray (Swedish pop)
- X-Ray Dog (production music library [XRCD#])
- X-Ray Pop
- X-Rx (electronic dance music group)
- X-Samar
- X-Score (composer team)
- X-Seamen's Institute
- X-Session (Belgian dance/pop act)
- X-Sinner
- X-Sonic
- X-Static (Max Artusi, Paolo Visnadi, Ricky Stecca)
- X-Treme
- X-Vivo
- X-Wave (Avraham Gindos, trance)
- X-Wave, Gotti & Unterm Radar feat. Kardo & BANGWHITE
- X-Wife
- X‐Ecutioners
- X‐Ecutioners feat. M.O.P.
- X‐Ecutioners feat. Pharoahe Monch, Xzibit, Inspectah Deck & Skillz
- X‐Ecutioners feat. Shinoda, Mike & Hahn, Joseph “Joe”
- X‐Ecutioners feat. Zombie, Rob, Slug & Scott, Josey
- X‐Ecutioners featuring Shinoda, Mike and Hahn, Joseph “Joe”
- X‐Fade (Italo-Dance/Euro-Dance artists)
- X‐Perience
- X‐Perience & Ure, Midge
- X‐Press 2
- X‐Press 2 feat. Byrne, David
- X‐Press 2 feat. Byrne, David
- X‐Press 2 feat. Harvey, Robert
- X‐Press 2 feat. Wagner, Kurt
- X‐Raided
