Place it at the very start of a birthday montage, before any clips of the presents, decorations or party games, so it sets up the celebration for everything that follows. Follow it with the Chipmunk Laugh after the greeting, then close the sequence with the Victory Sound Effect once the cheering begins.
About this sound
This is a very short Happy Birthday clip, lasting about a second and a half, centred on the familiar birthday greeting and the Gumbonola name. It feels cheerful and instantly celebratory, like the first burst of a birthday singalong, and it works because the greeting lands immediately without any buildup.