There are several artists using this name:
1) GRETZKY is a young Polish Dj. Born 1985 in Krakow. Plays very energetic but not only happy tunes. His favourite styles are: BreakBeat, Drum & Bass, Old School, Hardcore and similar.
Often plays in ROENTGEN Club / Krakow /

here u can download some mixes:
web site: www.flavaflow.com
2) Gretzky is an indie/ rock band from the northwest corner of connecticut! If you like having fun then you’ll love this band. Started by a young hard-working DIY musician who has been involved in the ct scene for a few years and different bands. Keep a look out for these guys!
Takes lots of influence from bands such as, Say Anything, Saves The Day, New Found Glory, Fireworks, The Movielife, Lifetime, Kid Dynamite, Shook Ones, Give Up The Ghost, Boys Night Out

3) Gretzky
Gretzky is an Acoustic Folk/Punk artist from Ottawa, Ontario Canada. Listen to his first single Backpack at his Facebook page: www.facebook.com/gretzky613 Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.