Comment by baubino

It’s called creative visualization. It was used by a music instructor I had back in the 80s. I’d be given a new piece of music, asked to look it over and imagine myself playing it, but without moving my body. This meant imagining exactly how my body would move but without actually moving at all. After five minutes or so of imagining, I’d play the piece and get through it nearly perfectly and have it mostly memorized.