Normally, I’m not a big fan of listening to Mass on the radio. Most of the time though I leave it on anyway and try to listen and get something out of the readings and the homily. Recently I left work early and when got in my car the mid-day Mass was just beginning. I almost turned the station but stopped instead as my ears listened carefully to the opening hymn being sung. I couldn't help but notice that as each verse was sung the tempo got slower and slower. By the end of the hymn it was dreadfully slow compared to where it had started.
As a musician I can tell you exactly why this happened. And it is very common. I bet we've all experienced it at some point. I've experienced this phenomenon at churches, in processions, in parades and on the football field (think marching band), and in large groups of singers with no leader to keep the tempo. Sound actually travels pretty slowly. It’s why you see the lightning before you hear the thunder (unless the storm is right over you). Without a leader or some sort of tempo-keeper singers and musicians start listening to each other. Because sound travels slowly, things start to slow down.
Go on over to Catholic Sistas to read the whole story.