Comment by MarkLowenstein

Since the early 90s I've used a piano-practice scheme that provides spaced repetition. It greatly reduces the time needed to either (1) learn or (2) memorize pieces. I always feel compelled to cite this poem:

You can get a great deal from rehearsal

If it just has the proper dispersal

You would just be an ass

To do it en masse

Your remembering would turn out much worsal.