I don't keep much classical music on my Zune, because I tend to listen on shuffle, and for some unfathomable reason, all classical music seems to be recorded at a much lower level than other music. So, when it's on shuffle, it's just silence and that's not cool.
But when I'm deliberately listening, I'm deeply into John Tavener right now.
“Music, the greatest good that mortals know,
And all of heaven we have below.”
Joseph Addison (1672-1719)