That might be useful if things returned to normal a week or two after an EMP. But I don't think it works that way. We're probably talking years, if not "forever", before electronics/electrical infrastructure gets repaired. On the bright side, most people would probably die long before their iPod battery did.

If I had music as a "must have" on my post-EMP list, I'd buy a training book and some kind of sturdy instrument like a harmonica, ocarina, recorder, panflute, etc. You'd have plenty of time to learn how to play it after an EMP. Even more time after you started starving, developed medical problems, ran out of water, and became bedridden while waiting to die.

I just can't envision be-booping around with your iPod while scrounging for cockroaches and grubs to eat.