The harmonic structure of a song sometimes seems to restrict you.

If you play a certain note against a certain chord, they will clash.

However, having a strucure forces you to work with it in creative ways.

If you’re watching a sports match, the players follow rules.

It wouldn’t be interesting if they got into the stadium or court and just did whatever they wanted.

Some poems, for example, the haiku have a very specific structure too.

And the haiku can be beautiful.

The structure helps set up a groove in music and lends itself to creating patterns that are related.