Why every round rolls a new tempo

The first thing a round does is roll a number between 60 and 120. Everybody in the room gets the same one, it is fixed for the four minutes, and there is no control anywhere in the editor to change it. That is deliberate, and it is doing more work than it looks like.

It stops the round being a warm-up

Producers have a tempo they default to. Left free, everybody would arrive at the round already knowing what they were going to make, and the four minutes would be spent typing out something they have played a hundred times. A tempo you did not choose is a constraint you have to answer, and answering it is the game.

It makes the contest legible

When everyone is at the same tempo, in the same meter, over the same eight bars, the reveal is a genuine comparison. Nothing sounds better merely because it was faster or longer. The only variable left is what you did with it, which is the only variable worth voting on.

The range is not arbitrary

Sixty is slow enough for half-time trap to breathe and a lo-fi loop to sit back. A hundred and twenty is fast enough for house and drum and bass to work without feeling clipped. Between them sit boom bap, synthwave and most of what people actually reach for. Going wider on either side would produce rounds where half the room has no idiom to bring.

One consequence worth knowing before you queue: eight bars at 60 BPM runs thirty-two seconds, and at 120 it runs sixteen. A slow round is twice as much music to write and twice as much to sit through at the reveal. It is the same four minutes either way.