Descifrando means "deciphering" or "unraveling". It's a less common verb in song lyrics, making it stand out as an interesting choice.
In the song, the artist sings, "Con tu silencio descifrando imposibles canciones de ayer" (With your silence deciphering impossible songs of yesterday). This powerful imagery conveys the struggle of trying to understand unspoken messages and past memories in the face of silence, adding a layer of depth to the emotional narrative.
Silvana Estrada wrote "Good Luck, Good Night" about being ghosted — and decided it should sound like something you would sing in a cantina at closing time. The Mexican singer-songwriter opens on the wound itself: "Me dejaste sola con tu silencio" (You left me alone with your silence). There was no argument and no explanation, just a disappearance, and she is left "descifrando imposibles canciones de ayer" (deciphering yesterday's impossible songs), turning old memories over for a clue that isn't there. "La duda es mi cárcel" (Doubt is my prison), she sings — the punishment is not the loss, it is never being told why.
The rest of the song is a reckoning with how wrong she was. She thought that singing "era tormenta, era flores, era fiesta" (was a storm, was flowers, was a party), and that she was loved "nomás por lo que yo era" (just for who I was). Then comes the line the whole song turns on: "Con qué dura moneda pagaste mi cariño" (With what harsh coin you paid for my affection). The goodbye she never got, she finally gives herself — in English, polite and completely final: "Ni adiós, ni buenas noches / Good luck, good night." No plea, no door left open, and not a raised voice anywhere in it.