Saw this on Slickdeals. I haven't used it before but I've heard of it, and heard good things. Looking forward to trying it out. FREE RIFFSTATION DOWNLOAD Riffstation uses automatic chord recognition technology to 'listen' to the music, isolate parts (i.e. bass lines), and figure out the chords for you. Load any MP3 and Riffstation will automatically detect the chords and sync the chord diagrams with the music. You can also slow down the audio, change the pitch, isolate or mute guitar parts, loop specific sections and even sync a metronome.