Interesting concept, you fill in your birthdate, replace ddmmyyyy with your birtdate e.g. http://geboortedaghit.nl/01071978 for July 1st 1978.
What you get as a result is #1 song at that time in charts (not sure which).
This is what I got (never heard it before to be honest). Note the number 22 appear in second 29 🙂
Champaign – How ‘Bout Us