A escondidas is a fun and slightly mischievous phrase that literally means "in hiding," but is used to say you're doing something "secretly" or "on the sly."
In this nostalgic ballad, Prince Royce reminisces about being "el que salía contigo a escondidas de tus padres" (the one who would go out with you secretly, behind your parents' back). This common expression perfectly captures the feeling of a young, forbidden romance, making it a memorable and useful phrase to learn.
Ever wonder if fame changes a person? In "Soy El Mismo," Prince Royce insists it hasn't changed him one bit. He's singing to someone from his past, reminding them that underneath the success, he's the same guy he's always been. He opens by talking about his career, with its "minutos de soledad / Y horas de alegria" [minutes of loneliness / and hours of joy], but the real message is for a specific person. He wants them to know he is still the one who would call at two in the morning to talk about his childhood dreams.
He gets very specific with his memories, reminding this person that he's still "aquel, el mismo de ayer / El que escribía sus canciones en el tren" [that guy, the same as yesterday / The one who wrote his songs on the train]. Even though life has taken them on different paths, he says that "Ni la fama, ni el dinero, han podido" [Neither fame nor money have been able to] change who he is. He's still the person who would give his life to be with them. It's a sweet and direct message about staying true to your roots and the people who knew you before you were a star.