Sirena literally translates to "mermaid". It's a beautiful and somewhat magical word that you won't find in every Spanish pop song.
In "Otra Vez", the singer uses sirena as a poetic compliment for a woman who reappears in his life. The line "Hoy vuelve a aparecer bajo la luna llena, sirena" (Today you appear again under the full moon, mermaid) paints a picture of an enchanting, almost mythical woman, making it a much more captivating compliment than simply calling her beautiful.
Have you ever run into an ex at a party and felt your heart drop right into your shoes? That sudden, dizzying panic is exactly what Puerto Rican duo Zion & Lennox and Colombian hitmaker J Balvin are working through in "Otra Vez" (Once Again). They bump into an old flame unexpectedly on the dance floor and immediately get suspicious: ¿Por qué será? ¿Por qué a mí? [Why could it be? Why me?]. Instead of walking away, they turn that tension into an excuse to rekindle everything. Seeing her instantly flips their reality upside down, leading straight to the catchy hook: Volverme a poner el mundo al revés [Turning my world upside down again].
What makes the track stick is how quickly they jump from playing detective to making moves. J Balvin sets the scene under a full moon in the coastal Colombian city of Cartagena, calling her his sirena [mermaid] and declaring, No es casualidad que nos viéramos en la misma disco [It's no coincidence that we saw each other at the same club]. If you're learning Spanish, you get some great party phrases here too: rumbear means hitting the town to dance and drink, and Lennox hypes up the escape with Dale, mami, que nos fuimos [Come on, girl, let's get out of here]. It is breezy, a little dramatic, and completely honest about how easily an old spark can pull you right back in.