I also listen to lots of jazz (Miles Davis, Duke Ellington, Ella Fitzgerald), modern metal (Opeth, Fear Factory, Tool, Rush), and yes, even rap (but not mainstream rap, the underground mcs like Royce, AZ, Canibus, Kool G Rap, NonPhixion, and Big Pun). Not so much for the music but for the way they twist vowels up when they talk. It's fun to dissect how they rhyme multisyllables.