We know that in the canon there are low power AM stations still broadcasting - New America was using them for propaganda purposes - one of them was mentioned in Urban Guerrilla - thus there have to be people using car radios, hand cranked radios, battery powered radios to pick it up - but may be limited times - i.e. "we will be on from 6am to 9am every other day" kind of operations
Also there are areas with power that is still on - Western NY from the generators at Niagara Falls, the area around Colorado Springs from the nuclear power plant there, etc - there you would have actual radio stations broadcasting and people listening to music on radios
As to performers - betting there will be lots of live music of various kinds ranging from a couple of guys with guitars or a banjo and fiddle all the way up to established musical figures - can see Ted Nugent for instance (who was and is a major survivalist figure here in the US) still around and still performing
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