Guitar & Drum Trainer at Bits du Jour
With Guitar & Drum Trainer, you'll be able to slow down music without changing the pitch! By setting the playback of the music to a pace that you can handle, you'll be mastering a whole new level of songs from day one! Pick out notes and chords that you never realized were even there when you were listening at full speed! Loop a segment of a song over and over until you can play it perfectly.
Disclaimer: I write GDT.