In the renascence there was a standardized system of memorized hand symbols to recall music. For guitar you can memorize fingerings by creating a person action object system in a way that tells you the fingering, the string and the fret number in one image. You can then use this to memorize classical music. With music you are going from conscious to unconscious procedural memory. But you can "double encode" using memory palaces and systems for a "backup". (It can actually help you learn it faster because you can get rid of sheet music)