I didn't go to my HS prom but attended my then-boyfriend's prom at the Hotel DuPont in Delaware. It looked a lot like this vintage photo from the 70's. My dress was the exact same color as that mint green one in the photo
(and I made it myself!). We ladies either wore our long hair straight down or had a picked out 'fro like the gal in the baby blue dress. We danced to B.T.O., Earth Wind & Fire, Wings, KC & the Sunshine Band, E.L.O., Ohio Players, Grand Funk, Elton John, Bee Gees...
Good times!