The most commercially successful Spanish singer of all time, Alejandro Sanz earned a reputation as an industrious hitmaker in his native country during the 1990s, and by the decade's end, he'd expanded his fan base internationally as he broadened his style beyond romantic ballads and began collaborating with fellow Latin superstars, most memorably Shakira. A talented songwriter with handsome looks, Sanz proved immensely popular even with his debut album, Viviendo de Prisa (1991), which was a number one hit in Spain. It wasn't until several albums later, Más (1997), that he was able to break into the international market, however, thanks to a key hit single, "Corazón Partío," that transcended his core female audience. He began focusing on the Americas during the early 2000s, beginning with MTV Unplugged (2001), which was recorded in Miami and subsequently released as an album intended to showcase the highlights of his back catalog as well as a newly written single, "Y Sólo Se Me Ocurre Amarte." He then retreated to his studio to record his most broadly appealing album yet, No Es Lo Mismo (2003), which found him breaking away from audience expectations and exploring his own musical interests. He did much the same on his next album, El Tren de los Momentos (2006), which was highlighted by "Te Lo Agradezco, Pero No," a passionate duet with Shakira, whom he'd collaborated with the previous year on her massive Grammy-winning hit "La Tortura." Even as Sanz broadened his style over the years, he never ventured far from his strength: romantic songs, generally ballads, tinged with flamenco and sung wholeheartedly with his distinct voice.