There appear to be several artists on Last.fm named Brett:
1) Brett are a trust-fund core band from LA or something.
2) is an artist from Cary, NC. Brett has released material on venerable internet pop label, Teenage Prayer.
3) Brett are a rock band from France, famed for their cover of Indochine's 3 nuits par semaine.
4) Brett is the host and creator of the "world famous" Wicked Pissa podcast: a show dedicated to and centred around video games. Read more on Last.fm