I've always been a believer in the "power" of song, that one can render a controversial message more palatable, either via jaw-dropping ivory-tickling or funny bone tickling, or both. Case in point: Justin Timberlake as Elton John reworking "Candle in the Wind" on behalf of the late Hugo Chavez. The only thing missing was a Gibb brother cameo.

http://www.theblaze.com/stories/2013/03/10/snls-hilariously-accurate-musical-tribute-to-hugo-chavez/

In another instance, a live performance can be transformative, transport either the lead singer or the soloist (again, or both) to a place where he or she can shine in such a way that they take the audience with them, where ego and envy dissipate, simply unable to compete with melody and musicianship. Case in point: A college student asks his idol, Billy Joel, if he can accompany him on his favorite song, "New York State of Mind."

http://www.theblaze.com/stories/2013/03/10/snls-hilariously-accurate-musical-tribute-to-hugo-chavez/

Both clips are wholly entertaining and inspiring, and in two totally different ways. As for the latter, many folks are saying the student "stole Billy Joel's thunder." I would contend it was happily lent to the lad.