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?

bash-my-github and bash-my-spotify are two things I've made a start on but are not public yet. They've been on the backburner for a while due to competing priorities.

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

Thanks for the tool and reasons for building it. I will check it out tomorrow!