The Suzuki method of music instruction (and perhaps other methods too, it’s the only one I’m really familiar with) requires students to intensely practice particular skills on their instrument. In a Suzuki recital students usually do not have music in front of them. All the pieces (and quite complicated pieces) are memorized. This requires that particular passages and songs be practiced over and over. A term that is used in music instruction is “muscle memory”. The piece is practiced so often, that the muscles remember how to play it on its own, without thinking involved.

https://www.blog.theteamw.com/2011/04/03/100-things-you-should-know-about-people-99-well-practiced-skills-dont-require-conscious-attention/