The band currently includes Tilo Gonzalez, Pancho Sazo, and Raul Aliaga (percussion), Sebastián Almarza (piano), Federico Faure (bass), Jaime Atenas (sax), and Hugo Pirovic (flautes).

The 1973 Chilean coup d'état cut soon the process of recording their second album, Terra Incognita, only released two years later and with a limited spread, given the closure of cultural spaces.

Fusion music and almost cryptic lyrics were their codes to survive the rigorous state surveillance, like in the song "Arcoiris de hollín": "Cuatro jinetes negros / pasan volando / Van levantando noche / niebla y espanto" ("Four black Horsemen / fly by / raising night / fog and fear"), included in the album Congreso in 1977, also sometimes referred to as "brown album" and in clear reference to the Military junta.

The exit of part of the band reduced the power of the group in the middle of the dictatorship, but the protest songs were cleverly camouflaged with poetic lyrics and musical complexities.

Beside him, the recently integrated pianist Anibal Correa and bassist Ernesto Holman, (who not only was an old acquaintance of Tilo Gonzalez, but would also become one of the most representatives of the new fusion sound of the group) completed the reshaping of Congreso.

Moving between the stages of the Nueva Canción Chilena, rock spaces that opened in those years, and college circuits, Congreso consolidated in this new context as a fundamental band of the Chilean scene.

Even though pájaros was critically acclaimed, it was never edited in Chile, which made them distance themselves from their local audience, generating a crisis that was settled shortly when Sazo (now with a PhD) returned after years of study in Europe.

As a result of that tour came the double cassette Gira al sur, which was distinguished by its emphasis on dance rhythms, bright songs and colorful staging, with which the band garnered all the fame scattered in twenty years of history.

The song "Calypso intenso, casi azul" was the emblem of the new stage, and the development and popularity coincided with the 1988 referendum that marked the exit of Augusto Pinochet from La Moneda, and the Chilean transition to democracy.

In this context, Congreso edited Para los arqueólogos del futuro (1989), an album with some of the fastest-paced rhythms in the band's history, and in which they sang about racial freedom, they played, ironized and deployed all of their instrumental resources.

The success of this period include themes that echoed those living with passion the Chilean transition to democracy, like in the song "Aire puro", which allowed them to participate in the legendary concert Desde Chile... un abrazo a la esperanza of Amnesty International in 1990 alongside renowned international artists such as Sinéad O'Connor, Sting, Peter Gabriel, New Kids on the Block, Jackson Browne, Luz Casal, Wynton Marsalis, Rubén Blades, and Inti-Illimani, among others.

Fuegos del hielo was composed for a modern ballet, in a classical style, referring to the extinction of the ethnic groups of the far south of Chile such as Alacalufes, Aonikenk, Yaganes and Selknam.

The work was exhibited at Teatro Municipal de Santiago as well as in the Festival of Italica in Seville, Spain, and the Opera of Budapest, in Hungary, among many other places in the old continent.

Sazo's work in this album is remarkable in that he was still doing great lyrics like "Pasillo de amor", a slower song, in the line of "Nocturno" which tells the love story of a prostitute and client.

While in the capital Estacion Mapocho was watching the remains of Eduardo "Gato" Alquinta, other news shook the music world: Jaime Vivanco (only 42 years old), composer and keyboardist of Congreso and Fulano, among other groups, was found dead at his home commune Recoleta on January 17.

Congreso launched a tour in the United States with encouraging proposals including participation in an international jazz festival and the ability to distribute their complete discography in North America.

Notable is the participation of Jorge Campos, who spoke about technique in the Jazz Institute of Music the University of California at Berkeley, and the intervention of Hugo Pirovic at Myrna Loy Center in a talk on flutes and ethnic instruments.

So, a reporter on one of the tours to the United States described his surprise when he realized that Congreso's complete records were transmitted on the radio in New Orleans, as was the case of La loca con zapatos and Los fuegos del hielo.

The album features songs by Tilo González and Francisco Sazo, and guests such as Brazilian Lenine and Ed Motta, plus the Chilean singer Magdalena Matthey.

Finally the release of the DVD entitled Congreso a la carta was held on September in a concert at the Teatro Oriente, becoming the most important audiovisual work of the band.

On January 5, 2017, they perform at the Rockodromo 2017 for the first time playing together in stage with Los Jaivas, at Plaza Sotomayor in Valparaíso, also celebrating the 100th anniversary of Violeta Parra, in more than 3 hours of music that featured the presence of 15,000 attendees.

On November 25, 2017, the new album entitled La canción que te debía (The song that owed you), was finally released in a double concert at the Teatro Oriente in Santiago.

At the same time, the book Los Elementos: voces y asedios al grupo Congreso of Rodrigo Pincheira, was launched, becoming the first literary work entirely dedicated to the band.

In 2019 for the celebration of the 50th anniversary of the founding of the band, a tour entitled Congreso en Todas las Esquinas is intended, with the ambitious plan to present 50 recitals throughout the country.

The concert lasted more than four hours and 44 songs were performed, and also had puppet interventions, dancers (ballet and afro), and permanent audiovisual support also touring its art and concept.

During November, they celebrated the 30th anniversary of one of the most emblematic albums of the band Para los arqueólogos del futuro (For the archaeologists of the future), in the midst of the social explosion that was experienced in Chile.

In 2020, Nano Stern, Simón González and under the symphonic direction of Francisco Núñez, made the tribute album to Congreso entitled Ya es tiempo, which has thirteen arrangements of emblematic songs by the band.