Original albums versus 'Expanded' or 'Remastered'. Personally, I like listening to albums the way they were first released. For example, Pet Sounds (original in Mono), or Quadrophenia (prefer the 1973 mix to the 2013 remaster). Sometimes, a missing song or a random addition to the Library is from a Remixed/Remastered album. If there were a way to exclude remix/remastered version — by, say, a pref checkbox that says 'Original releases only' or 'Hide remasters and remixes', that would be wünderbar!