The Adler posse knows a thing or two about the concert business. Lou Adler, the patriarch, is responsible for some of the great American cultural touchstones of the past 40 years, and a few of these moments are showcased on the wall of his home office in Malibu. There's the movie poster for The Rocky Horror Picture Show, a film he introduced to America as an executive producer. Next to it is a framed poster for Cheech & Chong's Up in Smoke, another production deal he spearheaded. He oversaw the production of Carole King's Tapestry, one of the best-selling albums...