López produced Gloria since he thought she was "a very interesting character" and he wanted to work with a woman. In 1982, López was invited by Charly García for the live performance "Yendo de la Cama al Living" and in 1986 joined Miguel Mateos on the band Zas. While in Mexico working with Mateos, López produced the first album for Mexican rock band Caifanes and also worked on their second album, "El diablito", along Gustavo Santaolalla. López produced in 1993 "Ave María" for Mexican singer Stephanie Salas. The album earned a Gold certification in Mexico. In 1997, Lopez was the executive producer for the album "Tributo a Queen", a tribute disc to British band Queen, that featured Spanish-language versions of songs such as "We Are the Champions", "Save Me", "Some Day One Day" and "These Are the Days of Our Lives", performed by Soda Stereo, Fito Páez and Illya Kuryaki and the Valderramas. The project became highly successful in Latin America. About the album, López said: "The 'Tribute' was very interesting because it put me in contact with a vast diversity of musicians from different countries and styles." The album included his favorite work as a producer: Molotov's "Bohemian Rhapsody/Rap, Soda y Bohemia". In 1998, along with artists such as Molotov, Cafe Tacuba, Julieta Venegas, Moenia, Beto Cuevas, and Aleks Syntek, he worked in another tribute, this time to José José in the successful album "Un Tributo". In Argentina, López worked with Argentinean singer songwriter Diego Torres. Their first collaboration, "Tratar de Estar Mejor" (1994), sold 700,000 units worldwide. López also produced "Tal Cual Es" (1999) and "Un Mundo Diferente" (2001) for Torres, the latter included the song "Color Esperanza", written by Torres, Coti Sorokin and López, which became an anthem of hope in Argentina, since it was released in the midst of the political and economical crisis in the country. The track was performed by children at most elementary schools back to back with the national anthem. "Un Mundo Diferente" became the best-selling album of 2002 in Argentina, selling 160,000 units and earned a Grammy Award nomination.