My favorites are probably classical, progressive rock (especially jazz-influenced), some classic rock, soft rock, and Baroque/Chamber pop.
But overall I really like two things in popular music: strong classical/jazz influence, and wind instruments (no shocker there, right? lol).
Should probably elaborate on classical, though. My favorite types of classical are Impressionist, Renaissance (choral), Baroque, and Classical. I'd say that's about right in order.
The only things I don't listen to are metal (I don't like screaming), country western (just don't like it), electronic, and rap. But I'm no hater, I like to keep an open mind.
My favorite bands:
Chicago (60s-70s, not later)
The Beatles
Streetlight Manifesto
The Divine Comedy
Blood, Sweat & Tears
Eagles
Kansas
My favorite composers:
Claude Debussy
Thomas Tallis
Wolfgang Amadeus Mozart
Johann Sebastian Bach
Maurice Ravel
Antonio Vivaldi
George Frideric Handel
Antonin Dvorak