The second entry in my ‘Let it Go’ week comes courtesy of Mitch Grassi of the a capella group Pentatonix.
Pentatonix won The Sing-Off two seasons ago and actually turned the grand prize — a recording contract — into a successful career. They have released two albums, one in the Billboard Top 20 and one in the Billboard Top 10. Their YouTube clips amass tens of millions of views.



