Blonde goes to the Doctor for a checkup

So this blonde goes to the Doctor for a checkup so doc starts asking her: Age? She starts counting using her fingers, says 22 ! Height? She sees a measuring type of about 5 meters, takes it barely gets to measuring and says 1.75 Then the Doc says, ok could I have your FIRSt name please at which the blonde gets stuck thinking a good while but eventually snaps out of it and replies , Angi !! Doctor curious of course asks her..Miss, I understand using your fingers to count your age, I understand you dont know your height and have to measure, but why did it take you so long to remember your name at which the blonde replies… Well I had to sing the whole thing to remember… .Happy Birthday to you, Happy Birthday to you , Happy Birthday dear…..