What do tube and music have in comon?

I've always wondered about why there's solid state and tube? So many people are into ss and so are them about tube. Maybe it's the music taste?
So here is the question. What kind of music do you really listen, beside all the chase for high end gears?
I do like my tube equipment when they sing all the classical music. Opera are great as well. Favorite composers would be Mahler, Shostakovich, Bruckner, Smetana, Bach.... and so on. Jazz sound fine as well, but not outstanding. Pop music doesn't sound good in the system.