There are multiple artists with this name: 1) Wolf is a heavy metal band from Sweden (active). Current line-up:
Niklas "Viper" Olsson – Lead Guitars & Vocals
Anders "Tornado" Modd – Bass
Richard "Raptor" Holmgren – Drums
Simon Johansson – Guitar 2) Wolf is a heavy/speed metal group from Japan (Currently disbanded). For this specific band, please change your tags to ＷＯＬＦ. 3) Wolf is a NWOBHM band from Cheshire, UK (disbanded).

Read more about Wolf on Last.fm.