By Mel, MN (Mehollop) on Monday, September 26, 2016 - 11:03 am:
Not sure if it's still standard practice, but crossing the bridge was the only time during my participation that the Pep Ban(ne)d was allowed to march in step - the purpose of which was to try to find the correct harmonic/frequency to make the bridge bounce for the rest of the parade.
... in retrospect, that may have been a mean thing to do. ;-)