better cataloging and search

Hello

Would it be possible to have a keyword system with a controlled vocabulary to reference the scores?
For example: [voice: bass] or [guitar: bass] because it is always difficult to find a score according to an instrument and a precise criter,, especially for the bass voice whose search is almost impossible in internet. And when you're a singer, you do not want to get musics for guitar or saxophon.

And a method to make the titles more homogeneous and ordered : composer | artist / catalog number / title of the work / title of the piece or something alike ? The title alone is something unreliable and very messy especially when the title is (badly) translated ...

Thank's