It's called a beat. The very greatest musicians have struggled with it. Try going to a piano, and playing two notes, black or white, that are immediately next

It's called a beat. The very greatest musicians have struggled with it. Try going to a piano, and playing two notes, black or white, that are immediately next to each other at the same time (a half-step interval). Further listening: Modest Mussorgsky's The Hut of the Baba Yaga, and Miles Davis' Someday My Prince Will Come.