More Cowbell allows one to add cowbell, and Christopher Walken, to any song. It is powered by EchoNest, which is an automated service for categorizing music. This is a competitor to Pandora, whose major disadvantage is that it requires large amounts of time (I once heard an hour) by an expert to categorize a single song. Why you ask, because they have over a hundred aspects to assess, sometimes as many as two hundred. So if EchoNest really is as good as Pandora then they will have a huge advantage going forward. Plus, now you can have more cowbell.