Right now we don't have a great way to collect information about errors in our data from our users in an actionable format. This was one key learning from Line-In, and something that we would look to improve with future features.
Artists who find errors with their data should work with their distributors to correct and resend that information.
On another note, if you aren't an artist but have noticed any of the following in a track, make sure to follow the steps provided inthis support site article:
Content with incorrect information (e.g. misspelled titles, wrong cover art, or release dates).
Content on the wrong artist page or two artists with the same name have their music appearing on the same artist page.
Corrupted audio playback.
A large amount of empty space at the end of a song.