"Buri-Buri" is a song about walking out the door after a bad stretch and finding that you actually feel fine. It opens with "No nos queda otra que salir" (We have no choice but to go out) and "Terminado el tiempo del dolor" (The time of pain is over). The chorus is pure relief: "Buri buri mi amor, ya me siento mejor" (Buri buri my love, I already feel better). "Buri buri" is not a real Spanish word, just a playful, bouncy sound, so don't go looking for it in a dictionary.
The verses get cheekier and stranger. "Si tú quieres me desnudaré" (If you want, I'll get undressed) is said with a shrug, and then comes the best image in the song: "Voy cruzando el mar sin pastillas" (I'm crossing the sea without pills), as if getting through life with no crutches at all. He wants "arcilla" (clay), something to shape, plus songs and "un pulmón de más" (an extra lung), which is a funny way of asking for more breath to keep singing. It is a short, catchy pick-me-up, and the future tense in "aprenderé a volar" (I will learn to fly) is a handy one to practise.