Bee Gees - Saturday Night Fever (don't laugh, you had to have lived it)
I worked in a Disco in Banff the year that album came out. There was some real bad music there for a few years, but the Bee Bees put out a lot of good music.
Everyone likes to make fun of Disco, but I hear the thump thump boompa boompa rythms of disco in a surprising number of recent stuff.
I also remember the night a really hot woman with 6" heals put one of them through the dance floor doing some 'cool disco moves'. Life was good.