There should be a link on every track/album to easily notify Spotify of incorrect metadata such as incorrect artist, track name, album art etc.
Updated on 2018-02-28
Hey folks! We're excited to confirm that Line-In can now be used by any Spotify user.
Line-In is a tool that allows our most trusted fans and music lovers (like you) to suggest edits to the information we have about artists, albums, and songs on Spotify. This will help improve, extend, and confirm the data describing music - which will in turn help us improve experiences for Spotify Users and the Artists creating the music on Spotify.
You can find the tool by clicking in the three dots next to an Artist, Album, or Song and selecting Suggest an Edit.