[Luke]

From
"10 AT THE EVENTS" under 10.7 section of COURTESIES AND RULES
The rule reads:

Music/Noise: No loud music, audio system, whistles, banging sticks, blow horns, etc. They interfere with announcements. They prevent teams from hearing important announcements, can be annoying, and can cause hearing loss.
Power may be shut off and/or radio/cd player, noise makers confisicated