I like some classical music - if it is instrumental (ideally one instrument!), fast, dramatic, and in a minor key. I like some pop music - if it is instrumental (or basically instrumental) with one instrument dominating, fast, dramatic, and in a minor key. I don't care for orchestras, vocals, lyrics, happy tunes, or "full" production sounds. Thus my favourite music includes Chopin and Beethoven solo piano works, and Slayer and Machine Head tracks with lots of guitar solos. I agree with you on the repetition bit, but then again, a lot of classical music (especially Mozart for some reason) sounds very repetitive to me.