Name 3 "dancey songs" by Pink Floyd.
Stones:
Roundly criticized as a disco ripoff when it was released, they even put out a disco 12" single of it, the bass is a pure dance-floor burn:
http://www.youtube.com/watch?v=KuRxXRuAz-I
Totally a late-70's disco funk track:
http://www.youtube.com/watch?v=xdO6DajbVW0
Takeoff of David Bowie's "Fame" which was a disco ripoff of Philadelphia International soul/Gamble & Huff etc:
http://www.youtube.com/watch?v=giOhzebqmDE
Really disco-ish thump, right down to the strings, which I have always thought recalled Elton John's "Philadelphia Freedom":
http://www.youtube.com/watch?v=RzTbTzUqJtM
Floyd:
A song that was also criticized as disco-y at the time. The guitar is a little Nile Rogers-like and the drums are very late disco-ish:
http://www.youtube.com/watch?v=YR5ApYxkU-U
This one I have already posted so it's cheating, but the handclaps and thumpy beat were apparently a production decision:
http://www.youtube.com/watch?v=ySO-gryuO-c
Although this may not qualify as "dance music", the bass is way too Bootsy Collins/Funkadelic (which if you believe the Schaffner book, they were listening to around the time of Wish You Were here alot), so it's likely the reason this sounds like something off "Standing On the Verge of Getting It On" is because of the funkified bass:
http://www.youtube.com/watch?v=wGmIL2gtieU