Our Humble Beginnings

Proof of Purchase is the Rochester Institute of Technology's premier, and only co-ed a cappella group. Affectionately known as "POP", Proof of Purchase looks to combine the ethereal qualities of the female voice with the strong base of male vocals. POP was established by Rachel Rood and Craig Martek in the spring of 2009. Since then, POP has sung with many fantastic groups like Fredonia's Premium Blend, University of Buffalo's Buffalo Chips, Syracuse University's Main Squeeze, SUNY Potsdamn's A Sharp Arrangement and RPI's Rusty Pipes.