This would have been handy to have during my early days in music ed. However, I have to agree with prior posters regarding caching and additional technical information for each instrument.

I'd also like to see the addition of the Sousaphone - being a Tuba player myself, I often have to explain to non-musical types that the horn I play is not what they've seen on the football field (although I spent years suffering through marching band).

Nice job overall, though. Keep up the good work.