As a pianist I'm a massive fan of Yann Tiersen (who did the Amelie soundtrack) but would NEVER use it as a show - and it's many MANY times worse in the world of aerial circus.
For me the worst music is generally anything repetative, or anything where the performer is just ignoring the interesting bits of it, even if they're keeping to the beat. Of course this is sometimes unavoidable if you don't know the music but even then, e.g. with good hand drumming you can have some awesome jams if both parties are using each other properly, so to speak...
Still can't get the image of Dunc prancing about with his poi to Madonna on the bridge at SGP. People are disputing the track, I know Like A Prayer was playing at some point but in my head this particular one was DEFINATELY Like A Virgin.
It was awesome.
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Three years of my life that took. And I get; "... nice."