Momento Cultura inútil:
The U.K. number 1 on the 29th July 1977 (my birthday) was 'I Feel Love' by Donna Summer.
The U.S. number 1 on the 29th July 1977 (my birthday) was 'Looks Like We Made It' by Barry Manilow. (which I love, cheesy as it souds...)
Got it here.