I almost heard Flight of the Bumblebee at one point (0:50 in the video). I think something like this could be useful as a music transcribing device -- listen to

I almost heard Flight of the Bumblebee at one point (0:50 in the video). I think something like this could be useful as a music transcribing device -- listen to a piece and move your pen up/down as the pitch rises/falls while the medium scrolls by. Then rewind and play.