Best Disco Track from the 70's & 80's

Whats the best disco track from the 70's & 80's.
Mine was Edwin Starr - Contact.
The video's may be a bit thin on the ground for this thread

I would say that Jackson's Don't stop 'til you get enough' is a good one, always fills the floor.

admit it, you've danced to this at some stage in your life! (most likely a wedding! )

Dancing Queen is simply the greatest dance tune ever.

for lancealot