The melody behind this clip is Happy Birthday to You, written by American sisters Patty and Mildred Hill and published in 1893 as Good Morning to All. Portuguese speakers adapted it with their own traditional lyrics, and Parabéns pra Você became the standard birthday song in Brazil and Portugal, sung before the cake is cut at nearly every party. The recording here is a short user-uploaded rendition typical of soundboard sites. Online it lives on in birthday edits, reaction videos and WhatsApp audios, where a few seconds of the familiar tune instantly marks the occasion.