Timing and Pocket
Same notes, same tempo, same line-up, and one night it sounds like a machine that happens to be switched on while the next it moves you. Musicians call the difference pocket. Everyone hears it and nobody can define it, which is worth being honest about.
- 2 separate skills
- milliseconds
- swing is not a fixed ratio
At which level
- Intermediate
- Any instrument, especially rhythm section
In short
The most important distinction in the subject is regularly missed. Keeping tempo is the long line: are you still at the same speed at the end of the song? That is a matter of seconds over minutes. Placement is where inside the beat you sit: ahead, on, or behind. Those are separate skills, they are trained separately, and being good at one says nothing about the other.
Micro-timing research is less romantic than the stories about it. Deviations are real, measurable and not random, and in professional ensembles the spread is small. Claims that a specific millisecond offset is the secret of groove run well ahead of what has actually been shown.
How you practise it
Two myths deserve retiring. Swing is not a fixed triplet ratio: measurements of jazz drummers show the ratio moving with tempo, up to roughly three and a half to one at slow tempos and flattening toward one to one when it is fast. And playing behind the beat is not a skill you have or lack; it is a placement you choose, and it only works if the tempo underneath is steady.
Where you run into this
- A band that is perfectly in time and still lifeless
- A drummer whose snare sits fractionally late and makes everything feel heavier
- A track that stops grooving when it is quantised
Our own examples
A groove with a swing control here, so placement is something you move rather than a feeling you are told about. Push it far and it stops being swing; pull it back and it stops being anything.