Nostalgia is a beautiful word that directly translates to "nostalgia" in English. While the word itself is similar in both languages, its use in Spanish music often carries a deep, poetic weight.
In this song, Rels B explicitly states, "Siento nostalgia del tiempo / Del niño que ya no seré" (I feel nostalgia for the time / For the child I will no longer be). This line perfectly encapsulates the bittersweet longing for the past and a former self, making it a central theme and a memorable word from the lyrics.
Rels B's "Intro Nostalgia" is a really honest look at growing up and changing. He talks about how he used to hear himself say things he shouldn't, and how people are always judging. But now, he's stronger: "Ya no tiembla mi voz, bebé, si hablo de ti" [My voice doesn't tremble anymore, baby, if I talk about you]. He acknowledges that things aren't the way they used to be, and that's okay, they don't have to be exactly how you want them.
What really sticks out is the feeling of nostalgia for his younger self, "Del niño que ya no seré" [Of the child I will no longer be], and for the excitement of experiencing things for the first time. But he's also found a new confidence. He says he doesn't laugh unless someone makes him, and he won't stay quiet if he's right. He's comfortable in his own skin now: "Me gusta ser quien soy" [I like being who I am]. It's a great song about embracing who you've become, even with a little longing for the past.