Have you seen this? www.thisdayinmusic.com
It shows you what was No.1 in the charts on the day you were born.
(Go to Birthday No.1 at the top of the site, you don't have to log in it's free).
My number 1's are
'You're So Vain' by Carly Simon in the US
'Long Haired Lover From Liverpool' by Little Jimmy Osmond in the UK
Loads of other good fun music trivia on the site as well.