I used to love when the band would start singing along with the drums at about the 40 second mark of the MN March. I haven't heard this at Williams in a while.
http://m.youtube.com/#/watch?feature=relmfu&v=Dwxzvtv_9N4
We still do that, but it's hard to hear it over the drums, plus I think some of the horns are still playing at that part, the tubas and maybe a few others. I also just think some people in the band don't like singing, and so either don't sing loudly or don't sing at all.