A registered nurse and fan named Yolanda Saldívar asked Selena's father to start a fan club in San Antonio, Texas. Saldívar had the idea after she had attended one of Selena's concerts. Abraham approved Saldívar's request. Abraham believed the fan club would bring in new fans. Saldívar soon became a close friend to Selena and the family. She was trusted and became the president of the fan club. In 1992, Selena released "Entre a Mi Mundo". The song "Como La Flor" became Selena's signature song. The album and the single helped her to tour in Mexico. Selena recorded a duet with Salvadoran singer Alvaro Torres called "Buenos Amigos" in 1991. The song got to number one on the Hot Latin Tracks. This became Selena's first number one song. Because of this, Selena was asked to perform "Buenos Amigos" in El Salvador.