Cucharadas de más literally translates to "extra spoonfuls." It's an idiomatic expression that adds a touch of playful exaggeration to the lyrics.
In the song, Carín León uses this phrase to describe the overwhelming beauty of his beloved. He sings, "Se le fueron cucharadas de más" (God gave her extra spoonfuls of beauty), implying that when God created her, he went overboard with the beauty, making her exceptionally stunning. This unique and charming way of expressing profound admiration makes the phrase memorable.
Carín León spends this one doing arithmetic that keeps coming up short. "Lo que me resta de vida se me hace poco / Pa' tanto que siento que quiero darte" (the rest of my life feels too short for all I feel I want to give you), and then he checks the sum again and admits it still will not cover it. The best moment is where he drops the romance and gets funny about it: "La neta, cuando te hizo y te puso la belleza / Se le fueron cucharadas de más" (honestly, when he made you and gave you beauty, a few extra spoonfuls slipped in). God, apparently, overpoured.
The title carries the rest. "Desde que te vi, mi vida empezó a sonar" (since I saw you, my life began to sound) treats meeting someone as the moment the music switched on, and every chorus lands back on "Empezó a sonar mi vida desde que te tengo" (my life began to sound since I have you). One line near the end admits there was a before: "Me curo con versos las cicatrices / Que en el pasado me dejó el tiempo" (I heal the scars with verses that time left me in the past). He does not stay there long.