Frets On Fire !!

Via Riemanns Cut

This is a great (free) game that reminds me of games like Amplitude on PS2. It's great fun and highly addictive ! You can even import your own songs into it and assign the triggers !

Available in Windows and Linux formats, it's a 32+MB download but it's an non installing piece of software that runs direct from it's own folder (I'm sure there is a technical name for that !! LOL)

Link in title.