- 4 Promille
- 4 PS
- 4 Reeel
- 4 Rumbos, Los
- 4 Runner
- 4 Strings (Netherlands dance duo)
- 4 Strings & Burton, Cathy
- 4 Strings & Day, Fenna
- 4 Strings & Fabio, van, Mike
- 4 Strings & Fridolijn
- 4 Strings & Gallagher, Audrey
- 4 Strings & Heath, Katty
- 4 Strings & Rivera, Denise
- 4 Strings & Sue McLaren
- 4 Strings & Teutenberg, Susanne
- 4 Strings & Thetford, Jessie Lee
- 4 Strings feat. Burton, Cathy
- 4 Strings feat. Cousins, Tina
- 4 Strings feat. Criado, Ana
- 4 Strings feat. Fridolijn
- 4 Strings feat. Gallagher, Audrey
- 4 Strings feat. Janson Lunar
- 4 Strings feat. K, Kaimo feat. Teutenberg, Susanne
- 4 Strings feat. Kennedy, Neev
- 4 Strings feat. Lawson, Ellie
- 4 Strings feat. Lumiere, Eric
- 4 Strings feat. Sphere
- 4 Strings feat. Sue McLaren
- 4 Strings feat. Teutenberg, Susanne
- 4 Strings feat. Thetford, Jessie Lee
- 4 Strings feat. Trance Classics feat. Lawson, Ellie
- 4 Strings ft. Cousins, Tina
- 4 Strings, K, Kaimo & Teutenberg, Susanne
- 4 Strings, Trance Classics, Lawson, Ellie & Sherif, Omar
- 4 the Cause
- 4 to the Bar (German lounge/latin/jazz quartet)
- 4 to the Bar (garage house ("Slam Me Baby" feat. Alexis P. Suter))
- 4 Trinity (Christian music rap group)
- 4 Tune Fairytales
- 4 United (has song "Don't Close Your Eyes")
- 4 Villains
- 4 Wings
- 4 Zimmer Küche Bad
- 4-2-4 (football anthems)
- 4-4-2
- 4-Kuma
- 4‐ize (US hip‐hop artist)
- 4‐Skins, The
- 4. (Rappeur français)
- 4.0 (RnB/swing/soul group)
- 4.9.0 Friedhof Chiller (German HipHop Trio / NOT the "4.9.0 Clizzic" Group)
- 4.9.0 Friedhof Chiller, Sicc, Schlafwandler & Okunorobo, Jayson
- 4*
- 4*TOWN (fictional band)
- 4*Town, Fisher, Jordan, Finneas, Levi, Josh, Ngo, Topher & Villanueva, Grayson
- 4+1 Ensemble
- 40 Below Summer
- 40 Cal.
- 40 Cal. feat. Writer, J.R.
- 40 Fingers
- 40 Ft. Ringo
- 40 Glocc
- 40 Grit
- 40 Thieves (collective of dance music producers in San Francisco, California)
- 40 Thieves (Irish Music Band)
- 40 Thieves feat. Qzen
- 40 Thieves, The (International heavy rock band, based in Switzerland)
- 40 Watt Dreams
- 40 Watt Sun
- 40 Winks (Belgian instrumental hip-hop duo)
- 40% (Omri Harpaz; Psy-Trance)
- 40000 Gang (french rap)
- 403 (Japanese melodic power/speed metal/rock band)
- 404 COLLECTIVE
- 404 Guild
- 404 Sensei
- 404.zero
- 404Billy (french rapper)
- 404hugo
- 404vincent
- 406 Project
- 408 (pop punk band)
- 408 & SadBois
- 408 Darwin
- 408 feat. Acorn, Taylor
- 408 feat. Titus
- 408, Quinn, Kellin & Magnolia Park feat. Roberts, Joshua
- 40ft to go
- 40mP
- 40mP feat. GUMI
