Are there any rating schemes for sheet music or music players?
There are a bunch of reasons why I'd like to know this:
- Playing several inetruments at various skilled levels, I'd like to get a rough idea of how difficult a piece is before I buy sheet music
- When having learned a piece I'd like to know which level I have reached playing that piece of music
- When looking for a music partner we should be able to say how skilled we are before having played together to avoid disappointments for either side when starting to play
There are a lot of ratings in sports (as for tennis players, climbing routes,...) but are there rating for sheet music or musicians, too?