Sgt. Pepper’s Lonely Hearts Club Band. Speakers for Steve Miller at Monterey Pop followed. Then the Dead, Metallica, Celine, Ed Sheeran and so many others. Now 50 years later, John and Helen Meyer, co-founders of Meyer Sound, are embarking on a yearlong, worldwide tribute to music, love and sound, visiting customers and celebrating a history of quality audio. Mix editor Tom Kenny interviews the Meyers from the Don Pearson Theater in the company’s Berkeley headquarters.