As announced a number of weeks ago, the public song/identify API (Echoprint Server) from The Echo Nest is now discontinued. We will continue to monitor and manage the Echoprint Google group and the open source project on Github. A number of developers are doing interesting things with Echoprint clients and servers, and we encourage everyone to use this forum for issues, questions, announcements, and discussions.
Thank you for using Echoprint!
-David