Grammy win for Pentatonix elevates a cappella on YouTube — mashable.com

LOS ANGELES — A cappella has never been a power player at the Grammys, but a win on Sunday for Pentatonix — who shot to prominence on YouTube and have had an incredible year because of it — stamps the streaming video phenomenon as a legitimate force in the music biz. Pentatonix won its first Grammy in the Arrangement, Instrumental or A Cappella category for ”Daft Punk,” a four-minute medley that touches on "Get Lucky," Celebrate," "Harder, Better, Faster, Stronger" and "One More Time."

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