[pohl]

Even if they're not interested in the subscription service model, there may be something here that can improve iTunes Radio's song selections:

"The service uses a personalization system combining recommendations based on listening habits and algorithms with human curation and playlists from music professionals, including other "guest" curators, such as Rolling Stone, Rap Radar, and Pitchfork. Song searches prioritize the original, master recordings of songs over other versions (such as covers). A feature known as "The Sentence" allows users to generate playlists by filling four blanks in a sentence with words describing various activities, moods, and genres."

http://en.wikipedia.org/wiki/Beats_Music