The producer of this video says this is based on longevity, radio airplay and pop culture relevance. You can find the list with download links on www.whatisthatsong.net

Straight No Chaser (SNC) was originally formed over a dozen years ago while students together at Indiana University, the group has reassembled and reemerged as a phenomenon – with a massive fanbase, more than 20 million views on YouTube, numerous national TV appearances, and proven success with two holiday releases, 2008’s HOLIDAY SPIRITS and 2009’s [...]