Frets on Fire( A very entertaining free game for your computer)

Hey I've been playing this game called frets on fire for a long time and I'd like to share it with you. Its free. It's really fun. Its like Guitar Hero but you use your keyboard as the guitar. And they have a song database online so you can download any song you want pretty much. Here is their websitehttp://fretsonfire.sourceforge.net/here is their forums and song databasehttp://fretsonfire.wikidot.com/http://fretsonfire.wikidot.com/custom-songsIts available for Linux( I have ran it on linux with no problems)
Windows( ran it on windows and it works with no problems)
Mac( I dont own a mac because I hate em' but if someone tries this on mac please confirm if works or not)Its very fun. Please do try it ;D

Looks fun, I'm opening the link.
For music games, I prefer O2Jam, there's an offline version if you google it. It's very easy to pick up but it takes a hell out to be a master.