"Hermoso Cariño" by Los Tigres Del Norte is pure, uncomplicated happiness. The singer has found someone he loves, and he is convinced she was a gift from above.
The title phrase, "Hermoso cariño" (beautiful darling), is repeated again and again. Cariño means affection, but it is also one of the most common Spanish terms of endearment, like "sweetheart". He calls her "Precioso regalo... del cielo ha llegado" (a precious gift that arrived from heaven), one "Que Dios me ha mandado... nomás para mí" (that God sent me, just for me). Nomás is a very Mexican word; here it means "only" or "just".
The best line is the comparison he uses for his joy: "Yo estoy como un niño con nuevo juguete" (I'm like a kid with a new toy). It is a little silly, and that is exactly the point. He is "Contento y feliz, no puedo evitarlo" (content and happy, I can't help it), and he wants to shout it: "Y quiero gritarlo" (and I want to shout it out). A short, sweet song you will be humming after one listen.