Modern and historic dance music needs a repetitious structure because that's what makes us able to dance to it. If you denigrate it because "it's the same thing over and over" or "every record sounds the alike" or even "it's boring," then you need a clue. Without predictability, it would be undanceable. Interesting, beautiful, intense, and a thousand other adjectives perhaps, but utterly and completely undanceable.

You know where the beats will be, so you can move on them.
You know what emphasis they will have, so you can move at the right speed.
You know more or less where the builds and breakdowns will be, so you can add moves and flourishes.

The Strausses understood this.
Joplin understood this.
Coltrain understood this.
Donna Summer understood this.

Today's electronic dance music composers (Ritchie Hawtin, Konflict, Basement Jaxx, etc, etc.) understand it too. If you think their music is emotionless and unchanging and dull, you should probably listen more closely. Within their drum patterns and synth layers lies movement and change like no other, audible to anyone willing to pay attention for a few bars.

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