Time signatures are grouping

Six identical quavers. Two different metres.

Both rows below contain exactly the same six quavers at exactly the same speed. The only difference is how they are grouped — and that difference is the time signature. In 3/4 the quavers pair up into three crotchet beats; in 6/8 they bundle into two dotted-crotchet beats. Look at the beams: 2+2+2 against 3+3. Turn on both ♪ tracks and the accents (the > marks) tell your ear which world you are in.

Accented clicks are louder and lower. Try each row alone first, then both together — same grid, different pulse.

What to notice

The maths lies; the grouping tells the truth. 3/4 and 6/8 both contain six quavers per bar, so as arithmetic they are identical. As music they are nothing alike — ONE-and-TWO-and-THREE-and against ONE-two-three-FOUR-five-six. The signature is an instruction about feel, not a fraction.

Beams are the metre made visible. This is the same beaming convention from the rhythm section doing its real job: a glance at 2+2+2 versus 3+3 tells a player the metre before a single note sounds.

This is what “compound time” means. In 6/8 the beat itself is a dotted crotchet that splits into three — nothing more mysterious than a different grouping of the same grid.

Continue in the course

This explorer pairs with the Time & rhythm section of the Essentials path, where the ideas are built up step by step — or head back to all explorers.