Rodgers, Edwards, Thompson immediately pre-Chic in 1976. Doing Earth Wind and Fire. Wow. Some of the best music ever made starts here.
Nile Rodgers has the story behind the video on his wonderful blog here. (Note that Nile's acronym DHM means 'drunk hot mess'.)
Update: I heartily recommend the Six Million Steps soul/disco site and JJ's Smoking Sessions mixtapes/podcasts in particular to all Chic fans. Every mix that I've checked out has been spectacular. In most cases, obscurities and interview snippets rub shoulders with old favorites in way that's completely intoxicating. Your mileage may vary, but probably it won't. This stuff's gold.