c)
Hi, so we know why Pianist is missing, and yes Discogs has two versions of the album
https://www.discogs.com/release/13542141-Michel-Camilo-Essence (4 547366 396485)
https://www.discogs.com/release/14183982-Michel-Camilo-Essence (192641064661)
and only the first has the Sheryl Cassity credit so I guess the songs were matched to the other album although I cannot see which one from screenshot, so no issue with the applications here apart from the piano issue we have already covered.
Both Jaikoz
and SongKong
allow you to force a match to a particular release.