HAPPY BELATED BIRTHDAY TO MY SONN

OLIVER is an English VOCALOID developed and distributed by PowerFx System AB in collaboration with VocaTone, and was released in December 2011 for the VOCALOID 3 engine. OLIVER's vocals are "based on a 12 year old boy soprano", a choir boy. His voice provider is from Britain, and during the time of recording, he was 13 years of age. Therefore, the identity of his provider has never been revealed for legal reasons.

[Thanks as always Wikipedia!]