It's like jaywalking, an offense that virtuallyeveryone commits. There difference between the two is that speed laws are actually enforced (though quite selectively), usually to meet quotas.
When music is playing is synonymous for speeding. When the beats are speeding it means that the music is playing. The word does have a reference to tempo. You wouldn't say that "Love and Happiness" by Al Green is speeding. You would say it about faster tracks.