Although I can probably tell you what kinds of music I like, it's a bit harder to order my music preferences. Let me approach this by describing the qualities I like in music and which music it can be found in.
COMPLEXITY
I tend to like complex music with lots of things going on in it. Styles include Progressive Rock, Ambient, Fusion, and Baroque. I also often appreciate Classical music.
AMBIENT
I like music that creates its own sonic environment. Ambient music does this, of course. So does some Progressive Rock. New Age and Impressionism are also good at creating sonic atmospheres. My favorite radio programs are Echoes and Hearts of Space.
FEMALE VOCALS
I love beautiful female vocals. I have several CDs by female vocalists in many different styles of music, including Ancient Music (Hildegaard von Bingen), Ecto (October Project, Sarah McLachlan), Alternative (Tori Amos), Country (Faith Hill), Pop (Madonna), Dance (B-52's), Techno (Enigma, Bel Canto), Celtic (Enya, Clannad), Native American (Joanne Shenandoah), Jazz (Sade), Lipstick Lesbian (Fem 2 Fem), and Christian (Amy Grant). But I generally hate Opera.
RHYTHM
I frequently like music I can dance and exercise to. I generally prefer to dance/exericise to complicated ambient music, such as Tangerine Dream. I also find that the sports music of John Tesh is good for this. Some groups I especially like dancing to include Bel Canto and the B-52's.
Overall, my favorite groups/artists include Bel Canto, October Project, Tangerine Dream, Yes, Asia, Rush, UK, Vangelis, Renaissance, and Faith Hill. My favorite composers include Hildegaard von Bingen, Antonio Vivaldi, Johann Sebastian Bach, Beethoven, Holst, John Williams, and Claude Debussy.