As a guy who sings Johnny Cash's cover of "Hurt" to his kids at bedtime, I got no problem with a 5-yo singing "Folsom Prison Blues." But unless his next number is "A Boy Named Sue," someone needs to step up and do something about those bangs.
8/1 update: Wesley's mom chimes in in the comments to address the bangs issue. My post wrongly implied that these Seattle parents were less than attentive or vigilant about their kid's rocker hair strategy. This is incorrect and unfair and is a direct consequence of my own rock illiteracy.
She says there was a haircut scheduled for the very next day after the recital. Also that they were going for a Brian Jones/ John Paul Jones thing [l, r].
Daddy Types deeply regrets the error.