One of my favorite applications is Transcribe! This is the best transcribing software I've ever used. I first started using it in 2003 and it's been central to my musical life ever since. However, then last year came the iPhone. With the iPhone, I now had a great mp3 player too. One day I discovered that there's an Audiobook Speed option in the iPod Settings with three speeds: Slower, Normal, Faster.
How about more speeds Apple? - like 1/4, 1/2. Adding just those two speeds would make a lot of musicians very happy!