A-M discounting number bands (...And Oceans to Mötley Crüe): 7791 tracks
N-Z (Nailbomb to Zyklon-B): 5084 tracks
So, I guess yeah. However, I think S makes up the largest segment of the whole thing, with 130 artists and 1156 tracks. Lots of big discogs in there (161 Sopor Aeternus & The Ensemble of Shadows tracks, 88 Sol Invictus tracks, 132 Skyclad tracks)
Talking of dicogs though, I reckon they're probably what's throwing my first half off quite so much. If I sort artists by number of tracks in winamp we see:
337 Iron Maiden tracks
194 Anal Cunt tracks
161 Sopor Aeternus & The Ensemble of Shadows tracks
159 Alien Sex Fiend tracks
132 Cradle of Filth tracks
132 Skyclad tracks
120 NunSlaughter tracks
107 Pink Floyd tracks
104 Therion tracks
104 Inkubus Sukkubus tracks
So, of the 10 artists I have collected more than a 100 tracks of, 4 are in the second half of the alphabet, and the largest are in the first half.
Interesting. But utterly pointless, of course.