I do one scale, two or three times, then switch to a piece I know. Then I go back and try again the portions of that just played piece—let’s say it’s Granados’s Spanish Dance Number 5—that I messed up. Play those two times, slowly. Then I’m on to a (different) scale, followed by a few bars of a totally new piece I’m working on. Enough for one pass. I take a break and play a few riffs from the first tune I ever learned, “Stairway to Heaven” (somehow it never gets old), and after that I’m ready to dive into Spanish Classical. That is interleaving.
