Metallica is classical music, no?
My usual mode is early jazz, classical music -- usually 1840-1935, but also some Baroque.(though we're looking to adopt a baby so right now enjoying my metal while I still can!)
My instrument is piano, so I prefer Ravel, Liszt, Prokofiev, Chopin, Schubert, and on the jazz side, the Duke, Basie, Joplin, Monk.
Big fan of the violin too, esp. the underrated jazz violin. Favorite combo: piano, bass, drums, violin, and a honey-dripping alto like The Divine Miss Sarah Vaughn.