It’s not only the notes you play, it’s also the notes you don’t…
Lesson 3 of Music Theory - Notes and Rests - when counting the 16th notes 1 e &a 2 e & a 3 e & a 4 e & a - what does the “e” and “a” stand for - if anything?
It’s the silence (pause) between the notes
16th notes are what you get when you divide a beat into 4 parts. When you only divide a beat into two part, you can “say” them by 1 &, 2 &, etc. But when you divide into 4 parts, you need syllables to represent the 4 divisions, which is what 1e&a does.