this has been bothering me for some time, since the 10.11.4 betas started (and thru with the final 10.11.4): if i try to add a song to an album in itunes, and match up everything (all metadata, and artwork)...either the files don't combine, or i get only the new song showing. if i quit and reopen itunes, i get two albums; same art, data. they won't merge (they will sometimes if i rename the album). not life & death, but annoying. however...seems that, in 10.11.5 pb1, the problem is fixed (tried it several times). so...just mentioning.