Piano Proficiency Level
At what level for example would you or should you be able to play something like Franz Liszt's Hungarian Rhapsody No. 2 or George Malcolm's harpsichord piece called "Bach before the Mast"?
Both pieces are at an "advanced" level. In general, however, I do not put a lot of importance on "level". If you want to play a piece, try it. If, after much practice, you are not ready for it, try again later.