What musical style is performed by the professional group 'Straight No Chaser' who gained recognition when a video of theirs, 'The 12 days of Christmas' went viral and who subsequently landed a five-album deal before changing their name to Another Round?
Another Round (group): Another Round, formerly Straight No Chaser, is an award winning collegiate a cappella group which originated in 1996 at Indiana University. Straight No Chaser (group):  In 2007, a 1998 video of "The 12 Days of Christmas", went viral with over 8 million views and subsequently led to a five-album record deal with Atlantic Records in 2008.
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