Pet peeve:
I really don't like it when a café has their music up, even if I really like the music. It can result in conversing folks unwittingly contribting to the din by trying to be heard over it. Even if the place is near-empty, it's uncomfortable. This is a day and age of practically everyone (who'd be hanging at a café) owning a personal media player (even if just their phone) and earbuds at the very least, so keep the music low and let us do our thing, 'kay?
And that goes double if the music has lyrics. Seriously.