Musa is the Spanish word for "muse," a person who serves as an artist's source of inspiration. It's a beautiful, poetic word rooted in Greek mythology that you won't hear in everyday conversation.
In the song, Rauw Alejandro reveals how deeply this person affects his art by singing, "Y ella es la musa de to' lo que canto" (And she is the muse of everything I sing). It's a powerful declaration that she is not just his love, but the creative force behind his music.
Rauw Alejandro kicks this one off with pure regret. He's thinking about the last time he saw someone special, admitting, "De ti, mal me despedí" (I said goodbye to you badly). Now he's stuck, wishing they could "continuar lo que no pudimos" (continue what we couldn't). He's trying to party and forget her, but it's not working. He says the alcohol has no effect and he's lonely at the club, remembering dancing with her. It's a classic case of not knowing what you've got 'til it's gone.
He makes it clear that even with his fame, no one else compares. He sees other women at his shows, but tells this person, "Pero tú eras aparte, de otro planeta" (But you were different, from another planet). He calls her his muse and begs for them to drop their egos because "yo te necesito, tú me necesitas" (I need you, you need me). The song gets very direct about his physical desire, repeating the line "Ya me estoy poniendo bellaco" (I'm getting horny) as he decides he's going to find her. It's a mix of heartache and intense longing.