CDDB is absolutely atrocious when it comes to classical music. It’s not that the albums aren’t there, but the track information is completely screwed up. The most common screw-up is using the “artist” field for the expression marking on the movement of, for example, a piano concerto. The net effect of which is to introduce 3-5 spurious artists into your mp3 library who have names like “II. Molto Adagio.” Now, maybe there’s a famous sackbut player named II Molto Adagio, but I doubt that he would be the priciple artist on Schoenberg’s piano concerto.
Normally it’s not such a big deal, but since the iPod doesn’t have a convenient search feature, scrolling through all the different movements while looking through the artists is a pain in the ass. It’s almost faster to type in all the album information by hand, but not quite. Damn you, CDDB.