Well basically FoF (Frets on Fire) Is a PC version of Guitar hero.
You play with your keyboard but you can play with a GH instruments too
and Rock Band instruments.
When you download it , there are only 4 songs in the playlist but you can download songs from : http://fretsonfire.wikidot.com/custom-songs
Theres not much to say.
And well , there is a very known mod called MFH That gives you GH and RB Themes and much more stuffs.
Frets on Fire : http://fretsonfire.sourceforge.net/
Custom Songs : http://fretsonfire.wikidot.com/custom-songs
The MFH mod : http://www.fretsonfire.net/forums/vi...p?f=11&t=25040
FoF without any mod : http://www.youtube.com/watch?v=Vs-2p7x6YA4&fmt=18
FoF with MFH : http://www.youtube.com/watch?v=bSGrKn8FD18&fmt=18