(With apologies to Jessica Hill.)
Happy happy happy happy happy happy happy happy happy birth
Happy happy happy happy happy happy happy happy birth day
Birth birth happy birth day happy happy birth birth day day
To happy to happy to happy to birth to happy to birth to day
Birth to happy day day happy to birth happy birth happy birth
Happy birthday to you Happy birthday you to
Happy birth happy day birth birth day Philip happy birthday
Happy birth happy birth happy day day birth Glass day birth
Happy birthday happy birthday happy birthday to you.
Then repeat as needed for the next four hours.