You want a disco inferno ?
All of those records were from the era , but not every one was a disco imo. The Taste of Honey song was number 1 for 1978. ( on WABC New York ) I remember staying up late and recording it off the radio in the countdown . Not sure I’d consider that one disco ...Chic and Summer, yes.
You had ABBA, Bob Seger , Paul Simon , Billy Joel , Wings , and Jerry Rafferty that year , definitely not disco
KC and the Sunshine Band , there’s one .