I guess what some call cross fades, I've always just called joins of sections. Some of mine are a bit clunky, but particularly since recording with a DAW, I've done many seamless ones. Usually, when laying down the initial tracks, with a drummer, if the song is recorded in sections, crossfading is a necessity although I can't get my head around calling it crossfading ! So I'll still call it joins. When doing it with drums, some cymbal hits from elsewhere flown in at the join work wonders. I tend to use the bass drum as my marker points so usually, if the join point is the bass drum hit, once completed, it's impossible to tell what has happened. Even I can't tell afterwards.