I wonder if shoulder mounted speakers that aren't touching the users ears could help resolve this to everybody's reasonable satisfaction. (That is, everybody who's not deliberately trying to broadcast their music to everybody else.)

That same line of reasoning could apply to music on planes. No one really needs to use a particular airline at a particular time or use a public park at any given time. It ceases to be a public place if a small group of people can de facto monopolize it by making it unpleasant for most other people to be there.

James Q. Wilson talked about this problem a long time ago... and why standard neighborhood shaming cannot really police it. Maybe there is an increasingly different set of norms among different generations which is why you have a breakdown in manners and even high school kids from affluent areas hitting "devious licks."

    Because the sanctions employed are subtle, informal, and delicate, not everyone is equally vulnerable to everyone else’s discipline. Furthermore, if there is not a generally shared agreement as to appropriate standards of conduct, these sanctions will be inadequate to correct such deviations as occur. A slight departure from a norm is set right by a casual remark; a commitment to a different norm is very hard to alter, unless, of course, the deviant party is “eager to fit in,” in which case he is not committed to the different norm at all but simply looking for signs as to what the preferred norms may be.

One person playing loud music makes the park less enjoyable for thirty people around them. That’s not “preferences”, when their method of consuming the public space affects the way everyone around them experiences it.

There are typically noise rules at most parks where I live. The people who "blast loud music" are breaking the rules, and annoying everyone else at the park. That's not cool, and they should get kicked out if they don't comply.

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