In 2005, Sanz collaborated with Shakira on her song "La Tortura". Co-written by Sanz, the song became an international hit, breaking the record for the most weeks at the number one spot on the Hot Latin Songs chart. The song exposed Sanz to a more diverse audience, and helped build anticipation for his next release. The first single from the album "El Tren de los Momentos", "A la Primera Persona", became his first song to enter the "Billboard" Hot 100, peaking at number 100 on the chart. The record was also noted for its guest appearances, which featured Shakira, Juanes, Alex González of Maná, and Residente of Calle 13.