Customizing new releases with the goal, to make them interesting for the widest possible range of listeners instead of keeping them "real". I don't speak about making a song shorter, so that it is more playable for radio stations ("radio edits") or something like that. I know that producers are for example forced to rearrange whole parts, replace lead instruments, even slow down or speed up the bpm, if they want their track beeing released on this or that label. (Speaking mainly about releases in the house/techno scene, but heard the same from people in hiphop/rap business)
Another thing is the whole K-Pop vibe and the way these artists are exploited and destroyed by the industry. Disgusting.