Nick Hornby was born on 17 April 1957. That week 'Cumberland Gap' by Lonnie Donegan was No. 1 in the UK charts. Shane Warne was born on 13 September 1969; his No. 1 in the Australian charts was 'The Girl That I Love' by Russell Morris. Hmmm... maybe that should be a plural. Emmylou Harris's DoB is 2 April 1947. She gets (from the US charts) 'Heartaches' by Ted Weems - a good one to set her off on her country music path. Barack Obama checks in on 4 August 1961. No. 1 in the US charts then was 'Tossin' and Turnin'' by Bobby Lewis.
All of which is from This Day In Music. Go find out your own No. 1 there. Me? I was born too early for the site.