Everything about when a sound happens instead of what it is.
The snare hits on beats 2 and 4 — the head-nod.
One full cycle of the count — in 4/4 that's four beats.
The steady thing you'd count or clap along to: 1, 2, 3, 4.
How fast the music is going, measured in beats per minute.
Beat one — where a bar starts and your foot naturally lands.
Two notes per beat — count "1 and 2 and".
The overall feel of a rhythm — the thing that makes you move.
A device that clicks at a steady tempo so you can play in time.
The 'and' halfway between two beats.
Two different rhythms running at the same time and not lining up.
The heartbeat under the music — the part your foot taps.
One note per beat — the plain 1, 2, 3, 4.
The pattern of long and short sounds you actually play.
Four notes per beat — count "1 e and a".
Slicing one beat into smaller equal pieces.
Delaying every other note so the rhythm limps in a good way.
Putting the emphasis where the beat isn't.
How fast or slow the music is moving.
How many beats are in a bar before the count starts over.
Three even notes squeezed into the space of one beat.