If the beat is time, flow is what we do with that time
The beat is only one half of a rap song’s rhythm. The other is the flow…The flow isn’t like time, it’s like life. It’s like a heartbeat or the way you breathe, it can jump, speed up, slow down, stop, or pound right through like a machine. If the beat is time, flow is what we do with that time, how we live through it.
– Jay-Z, from Decoded