Use Spotify instead of Rdio
Use Spotify instead of Rdio

Fix #4228
Since Rdio doesn't work anymore I've chosen to use Spotify here as a music streaming platform.
I'm not totally confident in these changes however so the PR requires a thorough review.
sendgrid/docs,sendgrid/docs,ksigler7/docs,ksigler7/docs,sendgrid/docs,Whatthefoxsays/docs,Whatthefoxsays/docs,Whatthefoxsays/docs,ksigler7/docs