Rayando comes from the verb rayar, which literally means "to scratch" or "to draw a line." However, in this song, it takes on a more poetic and desperate meaning.
The phrase "rayando el sol" (scratching the sun) is a vivid metaphor for an impossible task, like trying to reach the sun. The singer uses it to express the futility and desperation of his efforts to win over the person he loves, implying he's doing something incredibly difficult and perhaps even pointless, just like trying to leave a mark on the sun itself.
Have you ever been so desperate for someone's love that you'd try to reach the sun before you'd give up on them? That's exactly what Banda Los Sebastianes sings about in "Rayando El Sol"! This song is all about a love so intense it feels impossible to live without. Our singer is completely heartbroken, crying for "muchas lunas" [many moons] because the person they love hasn't called.
They've searched everywhere – "En el parque, en la plaza, en el cine yo te busqué" [In the park, in the plaza, in the cinema I looked for you] – but can't find them. The lyrics really hit you with that feeling of longing and desperation, especially when they say, "Es más fácil llegar al sol que a tu corazón" [It's easier to reach the sun than your heart]. It's a powerful way to say how out of reach this person feels, even though they're "atrapada entre mi piel y mi alma" [trapped between my skin and my soul]. Get ready to feel all the feels with this one!