[citation_please]

Hmm, electronic genres are definitely clustered around 128, 140, and 170 (+/-2), and those are all reasonable heart rates when you're partying...But a "human heart beat" can be literally anything so I'm not convinced.

[throwaway8879]

Perhaps they mean the average non-stressed, slightly relaxed rate of around 100 or so? I'm not convinced either, but it is interesting to think about. Tempo and rhythm/beat has such a profound effect on the emotional response to music.

[csihar]

Incidentally, 100 bpm is around the average tempo for reggae.