Is the following table for a simple music database in 3NF? If not why?
If Track_Id and (Track_Name, Track_Artist, Track_Album) are candidate keys, with no other partial or transitive dependencies, then the table is in 3NF. Think about this - can Track_Name determine Track_Album or Track_Artist, or can Track_Album determine Track_Artist? If not, it's in 3NF.

If the other two tables have candidate keys, they'll be in 3NF.