Somerville, MA - Sep 6, 2011 - The Echo Nest, a music intelligence platform powering smarter music apps across the Web and devices, has reached an agreement with Clear Channel Radio under which The Echo Nest's musical intelligence data will enable users of iHeartRadio to listen to and build custom radio stations. The Echo Nest platform maintains more than 5 billion data points on more than 30 million songs, including understanding of artist connections, song similarity, mood, style and detailed acoustic attributes (tempo, energy, danceability, time signature, key) to offer users a fully personalized radio feature.