I do actually remember what was number one when Edith was born as I meticulously filled in her baby record book - this went out of the window for Alban, sorry son.
Edith makes me smile, a lot, so it was rather apt that this was her song:
Lily Allen Smile
Alban's song is more forgettable:
Madonna & Justin Timberlake 4 minutes (Can you sing it without watching it first?!)