I looked, no one created packages with those 2 names that I could fine, although there are some clis for controlling spotify it seems. Were you referring to specific packages somewhere for github and spotify?
I was able to write a simple command that returned all songs a friend and I had in common in our public playlists.
I forget the exact syntax but it was something roughly along the lines of:
$ sort <(
user-playlists alice | playlist-tracks
user-playlists bob | playlist-tracks
) | uniq --repeated