Easiest Beat Tracking Algorithim I want a relatively easy to implement but relatively reliable algorithm for detecting beat locations in an audio file.What I am aiming to do is get the location of the closest beat to a particular time instant i.e if given current playtime, how can I get the location of next beat.Does anyone know of any algorithms that could help me solve this problem?
The matlab codes that implemented D. Ellis's algorithm are on their website: 

http://labrosa.ee.columbia.edu/projects/beattrack/