“The Wall of Sound was a turning point in the entire world of sound reinforcement. By the end of the ’60s, myself and others like me had hot-rodded it and milked every nuance out of [existing P.A. systems] … We had to move to a whole new concept, scrap everything and start over. That was the purpose of the Wall of Sound. And while it in itself wasn’t that successful, the endeavor, the goal of it was completely successful: completely rethinking and revamping the entire approach to sound reinforcement.” - Dan Healy 50 years ago today, the Wall of Sound debuted at Cow Palace in Daly City, CA. Labeled as “The Sound Check,” the show would last four hours and would witness the first live performances of “Scarlet Begonias” and “Cassidy.” Photos by Ralph Boethling, Steve Schneider, Ben Haller, and Ron Rakow