Take a look at Tomahawk player (http://www.tomahawk-player.org/ http://www.tomahawk-player.org/), which supports dynamic playlists. It uses Echonest to generate

Take a look at Tomahawk player (http://www.tomahawk-player.org/ http://www.tomahawk-player.org/), which supports dynamic playlists. It uses Echonest to generate them.