If you want some well recorded classical music that sounds quite good, AIX records makes outstanding Hires DVD-Audio/Video disks. I bought a few of them to get some classical, and the DVD-Audio 96/24 mixes are beautiful through the Axioms.

The favorites of what I purchased from AIX are Bach/Brandenburgs 3 and 5, and Brahms Piano Concertos. The Stravinsky Firebird/Ravel Bolero disk is also quite good. I believe they all come with DD and DTS options as well if you don't have a DVD-Audio player.