In the 80's is when Congreso, from the creative hand of Sergio, finds its artistic and technical apogee, with the positive response of a mass public, considering the non-commercial style they work, and the great reception of specialized critics.

Records such as Viaje por la Cresta del Mundo, (1981), Ha llegado carta, (1982), Pájaros de arcilla (1984), Estoy que me muero (1986) and Para los arqueólogos del futuro (1989) were recognized all over the music world as a fine fusion between jazz, rock, folklore and contemporary music united in the style called Latin American fusion.

He has also been a percussion professor at the Universidad Católica de Valparaíso for more than ten years and between 1986 and 1987 he played jazz-rock in the group Kamereléctrica, led by the violinist Roberto Lecaros.

He also composed the soundtrack for La Última Huella (2001), a documentary by Paola Castillo that deals with the urgency of recording the voices of the sisters Úrsula and Cristina Calderón, the last survivors of the Yaghan people.

In recent times, in parallel to Congreso, Tilo González has worked alone and with other musicians such as Andrés Márquez, Magdalena Matthey, Alexis Venegas, Quelentaro, Mario Rojas and Marcelo Aedo, and in 2002 he founded the record label Machi to open space to new creators in addition to their own work, their own musical language has made it possible to meet the Latin American world.