From Music Hack Day
 Heart Beat
A program that utilizes the familiarity/popularity of songs, combined with the overall speed (bpm) of the song to gradually lower heart rate and stress. Made for those in chronic pain/stress.
 About the hack
The program, written in Cycling 74's Max, first retrieves a playlist of songs based on parameters (familiarity, hotttnesss, tempo, similar artists) entered by the user. Then, a built-in browser searches for the top youtube hit based on the current song in the playlist (a legal way to listen to full versions of songs) via Google search and plays that song. After the song finishes, the playlist continues forth.
Should the heart rate become faster during a song, the subsequent song will have a slower tempo until the heart rate reaches an acceptable range.
If the heart rate drops too low, Rick Astley sings "Never gonna give you up."
 What APIs, tools or kit did you use?
Max/MSP + Echonest API = HeartBeat
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