Classical music. Except I don't care for bel canto opera, which bores me, Donizetti, Bellini, Rossini, early Verdi.
I guess my favourites are the big names (there's a reason they're big names), especially Brahms and Mahler but also Bach, Mozart, Beethoven, Richard Strauss, Schubert, the Renaissance polyphonists, etc.
I stay away from country music discussions that break out around here. My opinion of country music, and current popular music, is equivalent to a Jew's opinion of Hitler.
Of all Classic Styles I love Baroque myself. Classic Composers I think Mozart was a rocker and a true genius. But I find the classic influence in all kinds of music. I like older rock, some alternative, classical, a lot of country pop, some hip hop, no rap. I like some blues, some jazz, and instrumental blue grass. All form of music is good but there are a lot of bad performers.