Yousician could expand to other areas
In addition to learning instruments, Yousician can also teach you other skills like subjects in school.
I don't know if this is doable, but Yousician is a great music learning app, but it could also be used for subjects other than music. This is not a mandatory thing; just a suggestion.
Keep up the great work, guys! :)
Uhh..... it's a music app :P