This fantastically learned article explains how Giorgio Moroder invented the holy trinity of dance music:
In 1975, Moroder's label boss, Neil Bogart, played a copy of 'Love to Love You Baby' at a party at his house. The crowd demanded to hear it four times in a row, so he called Giorgio at 3am and ordered a 20 minute long version. The extended remix was born
That track, and more obviously 'I Feel Love', had a 4/4 kick drum, from a tape loop of a real drummer. The rhythm was much simpler than funk or disco, so white people (and even German/Italians with moustaches) could dance to it. Four-to-the-floor was born
"I Feel Love" was entirely electronic, and it was a 125bpm club record with a black woman singing over the top. House music was born (sort of)
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: 3:14 am