another great website you can spend WAAAY too much time perusing...
http://www.discosavvy.com/a VERY comprehensive survey of disco with lists (and lists and lists) of disco songs released in every year from '72 thru the '80s and beyond. As I'm putting together some compilation CDs of lost disco nuggets, this was esp valuable to me. Gaz and Alicat would particularly enjoy these lists, I'll wager.