I did some research and, through vgmdb.net, I've finally correctly tagged my Ys I, II and III albums (composer information). All this research revealed more mysteries, though. Does anyone know the correct composer information for the games above? I know who composed the music, with the exception of Ys IV, but I don't know which tracks they did.

I find the best way not to go crazy with albums is just to find the source material (scans, booklets) and use the information provided. Now when you've got gamerips, then you've got to go with the game credits or else -- like in the case of those older NES games that don't have credits...