I admit it, I have been resisting memorizing everything I work on. The pressure is on from my teacher to work everything from memory (well, not everything: the Popper etudes I’m still working from the music); increasingly we are not using the music during lessons, just working on a piece without it. Preparing for this takes an incredible amount of time and effort, and I do see that I am developing a more thorough understanding of the pieces. However….
I, so far, with most pieces, have not gotten to the point where the memory is so solidly there that I can play with freedom and emotion. With most of the pieces my brain is still focusing on the memory of what comes next: often the dynamics and emotion fall by the wayside. I’ve created some tracks with piano accompaniments (using Finale), and trying to play along with these is a great test of how far I’ve come in my memory work and in playing with proper tempo and rhythm. The Paradis “Sicilienne” at the end of Suzuki book 7 is a piece that I have been able to play comfortably from memory. (And also, although not quite as competently, the Eccles and Popper pieces from the same book.) Those have come more easily, I think, because they have very melodious singable phrases, and repeats of material (this makes the memorizing easier).
I’m learning the Faure “Elegy” from book 8 right now; I have most of the first page from memory and can play pretty comfortably along with a slow accompaniment. The tricky rhythms and fast runs of the second half are much, much harder; here, I think, memorizing will help me to be able to play the piece well, but the memory is harder because the syncopated sections and the fast runs have so much more detail (and the piano part is so different!). But the memory work is helpful.
Memory work on the pieces from the Bach Suites is much trickier and much more difficult to accomplish. It is dense, complicated music with so much detail that it is hard to keep everything in memory well enough to play with musicality. The Third Suite Bourees are okay; they are pretty melodic and have some helpful (!) repeating sections. The Allemande has taken an incredible amount of time and I’m still not there in terms of playing it well. I’ve just started learning the Sarabande; the double stops and complicated fingering will make this one another difficult one to learn and be able to play from memory. I read somewhere this week that the longer it takes to memorize something, the longer it will stay in memory. Hope that applies to the Bach Suites!!