Sunday, October 21, 2012 ∞
Capture what your friends are listening to, filter it for the kind of music you like, and save it as a playlist.
Try it out at smartio.herokuapp.com
How it works
It uses the Rdio simple API to log in to your account, pull the 25^ most popular artists among your friends, searches Last.fm for the top tags describing the artists, then if there is a match by the genre given by the user it makes a list of songs by that artist and creates a playlist out of it before forwarding you to that playlist on Rdio.
^ Limited by Heroku because the Last.fm method for grabbing genres is slow.