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Straight No Chaser (SNC) is a professional American a cappella group that originated in 1996 at Indiana University. Originally a student group at the university, they recorded a video in 1998 of a comical version of "The 12 Days of Christmas". The founding members all graduated, to be replaced by other students, in 1999. In 2007, the 1998 video went viral on YouTube, and subsequently led to a reunion of the founding members and a five-album record deal with Atlantic Records in 2008. The YouTube video has been viewed more than 26 million times.
The group continues as a student-run a cappella group at Indiana University (until 2012 under the same name, and since 2012 under a new name, Another Round). All members of the professional group have been members of the student group prior to joining.
General info from Wikipedia.org