The majority of the music on my zune is anything but classical since I usually use it while driving. But I still have quite a bit, even if it's a small fraction of what's on my computer. I have a lot of stuff on there by so-called minimalist composers: Steve Reich, John Adams, Philip Glass, and also Terry Riley's "In C." I also have most of my Kronos Quartet albums on there. There's also Sibelius symphonies, Copland's piano works, and those lovely string quartets by Ravel and Debussy. I have some excerpts and overtures from a few operas, but I also have a couple of whole operas on there like Bernstein's Candide, Kurt Weill's Threepenny Opera, and Osvaldo Golijov's recent Ainadamar. There's some avant garde stuff on there too. Like Morton Feldman's "Rothko Chapel," Pauline Oliveros's "Deep Listening" album, Berio's Sinfonia, and even Glenn Branca's first symphony for guitars.
There's much more, but those are just some of the choice bits.
They have the internet on computers now?!