Frustrated mentor, the problem is not on memory but on passion me thinks.
But anyway, you don't need to study that hard to practice it in a lucid, just make sure to 1) Leave the placebo of not-reading out, you can read 2) Stabilize before starting or then it might not be placebo and 3) Enjoy it, in dreams you can make anything happen, so for someone like me I would make the piano song be a weapon, that way if I play it properly there will be an epic fight, just device your stuff properly.