(Happy birthday) Happy birthday, happy, happy birthday This is your day to have a lot of fun We're all waitin' for the celebratin' We'll keep goin' until the night is done Blow out the candles on the cake And make a wish Then we'll serve everybody's favorite dish Happy birthday, happy, happy birthday It's your party but we have all the fun Gather around the piano We'll harmonize a few Sweet Adeline, dear pal of mine We'll sing the whole night through If someone thinks we're too noisy And knocks up on the door Invite them in and then begin one voice louder One voice louder, one voice louder than before Happy birthday, happy, happy birthday This is your day to have a lot of fun ♪ Happy birthday ♪ Happy birthday, happy, happy birthday This is your day to have a lot of fun We're all waitin' for the celebratin' We'll keep goin' until the night is done Blow out the candles on the cake And make a wish Then we'll serve everybody's favorite dish Happy birthday to you Happy birthday, happy, happy birthday It's your party but we have all the fun