I tend to listen to music while I'm reading, mainly because a lot of my reading time happens on the train, and the music helps block out the background noise.
Sometimes, you get a weird serendipity with music and reading. I still remember how I felt when I was finishing 'An Instance of the Fingerpost' and U2's 'With or Without You' came on the radio. It's a good book anyway, but the music helped lift the ending up into something astonishing.