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My son goes to a Spanish immersion daycare, and at pretty much every birthday party someone tries to start up a round of "Cumpleaños Feliz" after "Happy Birthday", which inevitably trails off into incoherence after "Cumpleaños feliz, Cumpleaños feliz..."
I thought it was because the majority of the parents are American English-speakers, but when I tried to find the proper lyrics, I found out that it's basically a free-for-all out there: https://www.cancionfeliz.com/letra_cumpleanos_feliz.php
Try searching for youtube videos and you'll find a bunch of 2-3 minute songs with a *lot* more lyrics, too.
First verse of the version from Peru lacks variety, but that second verse takes an awesome turn:
> Feliz Cumpleaños, a ti,
>Feliz Cumpleaños, a ti,
>Feliz Cumpleaños (name),
>Feliz Cumpleaños a ti.
>Que los cumpla feliz,
>que los vuelva a cumplir,
>que los cumpla bastante,
>Hasta el año 3000.
Yes, Peru, I, too, chafe under the yoke of mortality, and yearn for the day that humanity finally breaks free from our limited lifespans. Vivan todos.