Pentatonix

Ever since their appearance on The Sing-Off, I've been a total Pentaholic (that's a fan of Pentatonix, just fyi).  I finally saw them in concert - and nearly peed myself.  They sing a-capella.  Check them out, because... I said so?

It should also be noted that my boyfriend rocks for getting tickets to begin with. And putting up with my fangirlish squealing.