Celo is a fascinating word because it can mean several things, including 'zeal', 'jealousy', or 'care', depending on the context. It's not an everyday word, making it more memorable.
In this song, Darío Gómez sings, "Viejas monedas que guardé con tanto celo" (Old coins that I kept with so much care/zeal). Here, it conveys a deep sense of careful preservation and emotional attachment to the past, highlighting the song's theme of nostalgia.
Darío Gómez's "Nostalgia Del Ayer" is a heartfelt trip down memory lane, set right in a familiar bar. He's looking back at all the stories and the old piano that used to play, but isn't there anymore. It's a place where he'd choose songs for a past love, the kind of tunes that make you want to drink and remember, as he sings, "De esas que obligan a beber y recordar" [Of those that force you to drink and remember].
He even kept old coins, "Viejas monedas que guardé con tanto celo" [Old coins that I guarded with such zeal], just to put them in the piano and drink away his love for someone. Now, those passionate melodies only leave him with memories and the "nostalgia del ayer" [nostalgia of yesterday]. It's a bittersweet reflection on how everything becomes history, and all that's left is that feeling of longing for what's gone. He invites his friends to raise a glass to the past that will never return, a truly relatable sentiment.