Performous supports songs in UltraStar, Frets on Fire and StepMania formats. Microphones and instruments from SingStar, Guitar Hero and Rock Band are autodetected as well as some dancepads.

Install performous-freesongs and portmidi from KCP before you install performous itself. Find more Songs here: http://stepmaniaonline.net/index.php?page=downloads - http://fretsonfire.wikidot.com/packs

Here is how to add them: https://github.com/performous/performous/wiki/Songs#Adding_own_song_folders