Charly was the track that started the demise of "rave" - in the UK anyway, it still lives on in Germany - after Charly, rave was all chart-orientated stuff featuring samples from Sesame Street or Rhubarb and Custard.
Here are some of my favourite early dance classics off the top of my head, I'm sure I could list loads more:
Gat Decor - Passion
Awesome 3 - Don't Go
The Age of Love - The Age of Love
Interactive - Forever Young
Love Decade - So Real
Starlight - Numero Uno
Liquid - Sweet Harmony
Artemisia - Bits 'n' Pieces
Tricky Disco - Tricky Disco