In the spring of 1974 I was in a college rock band that had the distinct honor of being the "front band" for Earth, Wind, and Fire, a band out of Chicago on their way to Los Angeles and Don Kirschner's Rock Concert, a late Friday night TV show that led to their international fame. I hadn't heard much of their music at the time, but I certainly became a fan after I saw them. As local boys, our band thought we'd blow the audience away, but they seemed more knowledgeable, and held their praise for the headliners, and after about two minutes into the Earth, Wind, and Fire set, I understood why.
RIP Maurice White.
Footnote: In 1979 I was in LA visiting my girlfriend, and Maurice lived across the hall in her apartment complex in North Hollywood. Small world, isn't it?