I also have my MP3s by Album Artist - Album directories with their M3U playlists (ripped from my collection), but I don't want to dig through directories, that's why I use iTunes. I can search, get some pretty artwork so I can find which version of a song I'm looking for, add it to a playlist, etc. Cog is a player, but I want a music manager.
Ah I just want a player. I already manage my music - that's what the directories are for. Additional metadata about the albums stored a database isn't going to improve the music for me.
