There have been at least 3 bands under the name of The Warlocks.
1. A neo-psychedelic rock band
2. An early name of Grateful Dead
3. An early name of The Velvet Underground 1. The Warlocks are an American rock band based out of Los Angeles. Their music has been defined as neo-psychedelia, but much of it spans multiple genres.
After forming in 1999, the ever-changing personnel of The Warlocks meant that the band had already toured nineteen different members before it was slimmed to the classic seven-piece outfit that established their reputation.

Read more about The Warlocks on Last.fm.