I don't mind e-bikes for recreational use; having ridden with a few guys on them (them, not me) I don't see them as the evil some of you make them out to be. That said, I am not a great fan of the idea of using them in races. Firstly, the non-separation of category is absolutely wrong however you look at it; ultimately it's not really any different to (hypothetically) not separating solo from team riders in an event, where on one hand you'd have riders busting their arse for the whole three, six, ten or however many hours, and on the other hand having riders splitting the load & popping up fresh as a daisy every third lap or whatever - it's just not a level playing field, and chucking power-assisted bikes in the mix without distnction is no different. So if they're to be allowed, score them separately.
The difference of experience is always there, powered or not, especially at endurance events where the team aspect lends itself to encouraging newer riders. But again e-bikes are more likely to be ridden by less experienced riders. In the end though, passing and being passed comes down to rider courtesy, and that can be just as bad sometimes regardless of whether the bike has a battery or not - if you don't think you can make a pass stick, don't do it.
On the music thing, I'd rather people have speakers than earphones, at least they're more likely to hear you yelling at them.....