Hey @MadonnalovesHSM, thanks for being part of the Spotify Community! Great idea, but you'll need to ping the Barbie folks directly to make this happen,and ask why the music isn't on Spotify yet.
Many folks in the Community have requested certain tracks, albums or artists be added to Spotify. The reality is that we would like to have all the world's music available on Spotify. Anything which we have the right to upload and has been provided to us, should be available on Spotify.
Spotify signs new labels and adding great music every week. Hopefully your favorite music will be up soon.