Reverse Osmosis is a a premiere co-ed a cappella group founded in 2001. By 2006, RO became the first USC a cappella group to attend the ICCA finals, placing as semi finalists in 2011. RO also hosted the ICCA Western Division Quarter and Semifinals in 2009, 2010 and 2012. In 2009, RO opened for Ben Folds at the Hollywood Palladium, where RO was awarded the winners of the nights a cappella showdown. RO was named the champion of Absolut A Cappella in the winter of 2010 and in the spring of 2013. In 2009, RO traveled to New York City and Washington D.C. for a spring break tour. Upon the release of the movie Pitch Perfect in the winter of 2013, RO became the Honorary Pitch Perfect Pipers, appearing at Santa Monica Mall and on Access Hollywood to celebrate the Blu-ray/ DVD release of the film. RO has released 6 albums to date, their most recent being No Filter, released in 2014.