The guitar chart was sourced from Guitar Hero 2 and tweaked a bit to match the guitars in the original song. Vocals, drums and bass were charted by me.
Check out the "other downloads" for a track that will group with Harmonix's other releases from Aerosmith's Greatest Hits.
V2: Lyric formatting fixes. Also, the original and "Greatest Hits" releases now have separate ID's and internal names. They still have the same song name, so one may still hide the other in-game (I haven't tested that). The different ID's and internal names at least guarantee you can swap one back and forth with the other without losing your score on either version. As before, the charts are otherwise exactly the same. The "GH" version has the new ID and internal name, so the "original" V2 can replace the "original" V1 without jeopardizing your score.