In the periodisation GP is referring to, I believe Boléro would be Modernist, not Classical. The latter [0] refers to works by e.g. Mozart and Haydn, and followed the Baroque period of e.g. J.S. Bach.
(Incidentally, I do find Classical music quite repetitive — although on the other hand I’ve long enjoyed Boléro. Curious!)
Ravel's "Bolero", anyone? I hate that composition. Even Emerson Lake Palmer couldn't fix it.