She was also part of the first electric trio of Brasília, called Massa Real, and played the Surdo drum in a samba group.

[7] When she returned to Brasília, she replaced a friend as a secretary at the Ministério da Agricultura, but she was fired on the third day and decided to commit herself to singing.

[7] Characterized by her deep voice and her musical eclecticism, she played songs of great composers of Brazilian rock, MPB, pop, rap, sambas and international rock such as Cazuza, Renato Russo, Rita Lee, Caetano Veloso, Chico Buarque, Nando Reis, Riachão, Janis Joplin, Jimi Hendrix, The Beatles, John Lennon, and Nirvana.

In 1994 her third album was released, titled Cássia Eller, which contained the hit "Malandragem," an unpublished song by Cazuza.

[9] Influenced by her 4-year-old son, Chicão, who remarked that his mom shouted too much and that he preferred listening to singer Marisa Monte, Cássia began singing in a calmer manner.

[10] It was then that Cássia released her album Com Você...Meu Mundo Ficaria Completo in 1999, produced by Nando Reis.

She fulfilled the request of her son, Chicão, and included the song "Smells Like Teen Spirit" by Nirvana on her set list at the festival.

[citation needed] On this day, the sequence of acts was as follows: R.E.M., Foo Fighters, Beck, Barão Vermelho, Fernanda Abreu, and Eller.

[16] This included recording a DVD (live, as she preferred)[citation needed] and MTV Unplugged, between March 7 and 8 in São Paulo.

The project included artists of high artistic and technical ability: Nando Reis (musical direction / authorship, voice and guitar in "Relicário" / voice in "De Esquina" de Xis), the musicians of the band: Luiz Brasil (Musical Direction / Cifras / Guitars and Mandolin), Walter Villaça (Guitars and Mandolin), Fernando Nunes (bass), Paulo Calasans (Acoustic Piano and Organ Hammond), João Vianna (Drums, Surdo, Ganzá, Grater and Blade), Lan Lan (Percussion and Vocal) and Tamima Brasil (Percussion), guest musicians Bernardo Bessler (violin), Iura (Cello), Alberto Continentino (bass sound), Cristiano Alves (clarinet and bass clarinet), Dirceu Leite (sax, flute and clarinet), among many others.

[citation needed] The album has sold more than a million copies to date and became the biggest hit in Eller's career.

[citation needed] Cássia Eller died on December 29, 2001, in the Santa Maria clinic in the Laranjeiras neighborhood, in the south of Rio de Janeiro, after suffering three cardiac arrests due to sudden myocardial infarction.

[18] This was initially considered as the cause of death, but was dismissed by the coroner's report of the Medical Institute of Rio de Janeiro after a necropsy.

[23] Histopathological exams revealed Eller had heart problems, such as mild coronary sclerosis (early onset of fat thrombi) and myocardial fibrosis (scars from other pre-existing lesions).

[23] Eller's death came just two days before her scheduled performance at Praça do Ó in Barra da Tijuca, Rio de Janeiro, for the New Year's Eve celebrations.

[24] At several spots in Rio de Janeiro, there was a minute of silence during the homage of the passage of the year in memory of Eller.

[26] She is buried at the Jardim da Saudade Cemetery, in the Sulacap neighborhood of the city of Rio de Janeiro.

However, with her untimely death, the trophy ended up being delivered in 2002 to her mother, Nanci Eller, according to whom: "Last year Cássia performed in Curitiba, and Levir Culpi sent a Rooster shirt for her and her son.