Really they are useless. Most I find are missing half or more of the songs on all the services. I am not just talking about Apple Music. Play Music, Spotify all missing the same songs. One soundtrack on all of them only has one song. Play Music does not show them but the other services show them grayed out. Don't even bother to add them then. Just add the regular albums even though the same freaking songs are missing from the soundtrack albums even on the artist album. End of rant.