A nod to the "Sell me on Hal Jordan" thread for getting me thinking about this.
What kind of music have the various DC characters been shown to be fans of?
The most obvious example is the spot-on idea from the LEGO Movie that Batman listens to pretentiously horrible death metal he makes himself. That's now canon for me no matter what anyone says I also suspect Damian shares the same hobby. Like father like son.
During the Hard-Travelling Heroes era, Denny O'Neil had Hal Jordan be a fan of Dixieland music. In the 90s, Gerard Jones revealed that both Hal & John Stewart were fans of different kinds of jazz.
I'm pretty sure various creators have shown Lex Luthor as being someone who listens to obscure, dark and bombastic classical music.
Are there any other examples of creators putting the musical tastes of characters in the actual comics?