- Umberto Tozzi
- Umys
- Und3rw4t3r
- Under Life Ab
- Undercurrent Deborah
- Underscorer
- Unearthly
- Unghost
- Unhappiness
- Unhxly
- Unique
- Unistory's Gang
- Unit Blue
- United Peace Voices
- United Sound System
- Universal Mob
- Universallifeenergy
- Unkle Fezter's Ear
- Unknown
- Unknown Personality
- Unknown TM
- UNLIVEFUL
- Unlounge
- Unmarked
- Uno Bueno
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