Spotify requires that you connect a Spotify Account to Feeds before we can pull in tracks for artists or from your own profile.
Spotify tracks, much like Pinterest pins, will all show up at the top of your feed when you first add it as a source. If you let your feed run for a few days and pull in some new content automatically though, it will spread out into a more natural and blended order.
Artist: Use the Artist name to pull in the top tracks from an artist and display them in your feed
Your Top Tracks: Pull in the top tracks your connected Spotify account has been listening to. Spotify will update this list every day or so (it doesn't happen in real time) so over a few days, if you are listening to a lot of music, you will see many new top tracks pulled into Feeds.