Pentatonix

The a cappella group from Arlington, Texas, first garnered attention on the third season of NBC's The Sing-Off, where their talent for creating unique vocal arrangements of existing pop songs earned them the grand prize of $200,000 and a Sony recording contract.

They earned their first Grammy Award for "Daft Punk," a medley of electronic duo Daft Punk's songs, in the category Best Arrangement, Instrumental or A Cappella.

Maldonado, Hoying, and Grassi were high school friends who formed a vocal trio to compete in a radio competition for the chance to meet the cast of Glee. Their rendition of Lady Gaga's "Telephone" didn't take the top prize, but it did earn them a following on YouTube.