I don't see an issue with it as long as they keep the boom boxes close to the dugouts first of all and keep the volume fairly low just so the music can mainly be heard on that field. The bigger the tournament, the more chances that these music boxes will be used.
In PCB at the world series these boxes were everywhere, I had never seen anything like it. Don't punish the girls just because there was a parent that was an A$$ about it, and playing explicit music. The TD's need to set a rule that it can only be heard at the field being played at as to not distract from the competition at an adjacent field and the music selection should be in good taste. From my experience the girls enjoy having the music around and it lightens things up in the dufout.




























