Do you remember the 21st night of September? Probably not because it's currently the morning of September 21. But it's not too early to celebrate because it's officially Earth, Wind & Fire Day in honor of their iconic "September" song. Since its release in 1978, "September" has become a universally beloved track, selling millions of copies globally and causing countless people to stop what they're doing and start boogying anytime those horns kick in. But why did the legendary band decide to shout out September 21 on the track at all? It turns out, it was likely chosen at random,...