I took great pride in my mix tapes and later CDs....I was the only one I knew that put in the effort to roughly level match the volume of them track to track (no ReplayGain back then). Everybody at work would be running back and forth to adjust the volume at each song's start, but not me.
They stopped using that on the music files several years ago, although older purchased files would still have it. It does still exist on the video purchases though, I believe. http://www.macworld.com/article/1137946/itunestore.html