I think retrieval practice could also represent a fundamentally different approach to learning. Where efforts to play from memory are baked into the learning process from the very beginning.
When I was a kid, memory was something I never thought about until I had gotten a piece totally learned. I saw it as a task to engage in during the “polishing” stage of learning a piece, to get it ready for performance. But how might our approach change if we saw memorization as an integral part of learning a piece from Day 1? Not as some add-on at the end of the learning process?
I know some musicians who do this. Who spend the first week or so “learning” a piece so that they can play it from memory, however imperfectly and haltingly, from a very early stage. And a 2007 study (download PDF here), which follows a concert pianist as she learns Debussy’s Clair de Lune, found that a deliberate effort was made to emphasize memory from the very beginning, even if it meant “muddling” along in a start-and-stop-and-pause-and-think kind of way at the outset.
This was a completely foreign idea to me, but in light of this study, is starting to make a lot of sense.
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