Two types of music

We were drunkenly choosing which of her records to play. We'd gone through Led Zep, the Beatles, Springsteen (which nobody but me had liked), The Kinks, The Jam… it was now probably about 4:30am. The guy talked about music constantly. He'd asked me earlier what the only two types of music were. After thinking about it then saying 'jazz and classical?' (no), 'the Beatles and the Residents?' (no), 'opera and pop?' (no), 'Chuck Berry and Mozart?' (no) and probably some others too, it suddenly came upon me and seemed so obvious: good and bad. But, still, that guy just really annoyed me.