It's the classic: a barbershop quartet singing Happy Birthday as a singagram.

 

Barbershop-o-gram has mastered the art and can be relied on to bring a smile to the faces of all present.

 

They have wished a barbershop happy birthday to all ages (their oldest was 100) and they have their very own arrangement of Happy Birthday with which to serenade the birthday boy or girl.

 

The brilliant children's author Judith Kerr has even received a serenade from the group on her 90th birthday.