Spotify does a pretty good job of putting a radio station together based on one song, album or genre. When it comes to basing a playlist on multiple songs it's awful. I had Allman Brothers, Grateful Dead, Led Zepplin, Pitbull, Miles Davis and Cypress Hill in one playlist. Based on this you would think (it wouldn't be a terribly complicated alrogrithm) that most of my songs should be based off songs in the 70's. Throw in a few modern songs similar like Pitbull and maybe round it off with a few jazz songs. All it played was rap and hip hop (which I like by the way, but not every song based on my current playlist).
Is there a third party app that can create a radio based on a multiple song playlist?