Before they became the most visible flamenco duo of the early 2000s, guitarists Rodrigo Sanchez and Gabriela Quintero bonded over heavy metal while growing up in Mexico City. They combined their talents for a time in the metal group Tierra Acida, playing around D.F. in the roughest clubs the city had to offer. Though they recorded some material, Tierra Acida never hit it big, and an album was never released. Instead, Sanchez and Quintero concentrated on learning more guitar styles, teaching lessons during the day, and playing bossa novas in hotel bars at night. Bored and frustrated with their chances in the Americas, the two decided to try their luck in Europe instead.