Today, I'm starting a personal 3 day app challenge. In the next three days, I plan to write a web app called MixTrip 2.0. I originally wrote MixTrip about 2 years ago to translate Spotify playlists into Rdio Playlists. Version 2.0 will allow you to sync playlists between three major music services: Spotify, Rdio, and Beats Music. Let's see how this goes.