If you haven't seen or heard Straight No Chaser's acapella mash-up of The 12 Days of Christmas and Toto's Africa, head to YouTube right now. I'll wait.

The group of 10 friends, who originally started the group back in 1996 while they were all attending Indiana University, have become YouTube sensations over the past three years and will be making their way to London on February 9 when they perform at Aeolian Hall during their first cross-Canada tour.

Straight No Chaser began when a bunch of guys who liked to sing decided to start an acapella group. Since then, the group has become a bit of an Indiana University legacy, with students auditioning and continuing on the tradition each year at the school.

The original 10 broke into the big time around their 10-year reunion. Randy Stine, from Chicago, dug up old videos and put them on YouTube to reminisce with the other members. In December 2007, they suddenly had about six million views in three weeks. Then the telephone starting ringing, and in came a call from the CEO of Atlantic Records.

Fast-forward to 2011, Straight No Chaser has released two successful Christmas albums, Holiday Spirits in 2008 and Christmas Cheers in 2009, as well as a non-Christmas album, With A Twist, that made it to #29 on the Billboard Top 200. They've also nabbed the attention of big names, like Jason Mraz, who Stine met at the 2010 Grammy Awards. Mraz said he enjoyed their cover of his hit I'm Yours. They also performed with Barry Manilow on their album With A Twist, opened for him at the Hollywood Bowl in 2009 and will be doing so again in London, England this year.

"We're having a really great time," said Stine, on the phone from Phoenix, AZ.

The 10 members all had different lives and were living in different cities before their musical success took off. Not all of them had even been involved in music in university, some choosing to study business, biology or telecommunications. Now this is their full-time job, said Stine. "None of us could keep a regular job schedule."

Their shows have the same kind of variety, featuring acapella standards scattered among songs like Under the Bridge and Wonderwall, They aim to appeal to a range of audience members.

"We try to pick songs the audience wouldn't expect us to do," said Stine. "Five years old to 100, that's the range we like to see in the audience."

Regardless of the size of the venue, audiences can expect a laidback good time.

"We like to keep the show loose, we have a good time every time we're onstage," he said. "Our biggest thrill is making sure the audience has a good time."

For more information on the band, visit www.sncmusic.com or YouTube them.