uillán played as violinist in the Roberto Firpo and the Francisco Lomuto orchestras.

In 1944 he put together his own music group on request of the singer Telmo de Ferrari and at that period they appeared on the radio station La Voz del Aire.

The vocalists that passed through his ranks were Teófilo Ibáñez (already consecrated in his tenure with the Rodolfo Biagi orchestra), Carlos Pellegrini (whom Alfredo Gobbi changed his name for the sobriquet Jorge Maciel), Carlos Valdez, Carlos Tagle (at that time known as the dancer-singer), Aníbal Llanos (later known as Juan Carlos Godoy), Carlos Vidal and Raúl Moyano, among others.

The activity of the orchestra lasted until late 1957, appearing on Radio El Mundo, Radio Splendid, at the cabaret Chantecler, La Armonía, Richmond on Suipacha and the Nobel tearoom.

In some interviews Juan Carlos Godoy said that he joined the orchestra fronted by Guillán on recommendation by Juan D’Arienzo, because he had gone to an audition with the «Rey del compás», and as he had Alberto Echagüe and Armando Laborde as singers, the leader suggested him to see his peer and friend.

Godoy —under the sobriquet Aníbal Llanos— recorded two pieces with Félix Guillán: “Llanto de pierrot” and “Marcha”. Carlos Vidal cut four tracks for the TK label: “Lloremos”, “Tu vendaval” (Enrique Lombardi), “Y así nació este tango” and “Azul y rosa”.

The orchestra had outstanding players, like the bandoneonists: José Libertella, Abelardo Alfonsín, Oscar Basil and Ángel Baya; the pianists: Osvaldo Berlingieri (at the first stage), Norberto Ramos and also José Colángelo who had a short tenure; the violinists: Clemente Arnaiz, Claudio González, Eduardo Walczak and Camarota; and the double bass player: Enrique Marchetto.

Félix Guillán appeared on Radio Belgrano between 1955 and 1957 and in September that year the orchestra was disbanded because of lack of job.

In 1962 he reappeared with a new project, Los Tangoleros, a modern ensemble that comprised 6 violins, viola, electric guitar, drums and bandoneon or accordion, according to the music piece.

Los Tangoleros recorded with the singer Carlos Vidal, two double records for the Yulmar label and two LP’s, between 1965 and 1968, for the DOMA label. Besides Carlos Vidal, the singer Alberto Cuello recorded the tango “Rosa de Tokio” as guest artist.

After a withdrawal of several years, Guillán returned to put together again his group Los Tangoleros, for the recording of an LP for the ALMALI label, with the singer Oscar Macri in 1982.

As composer he wrote “Azul y rosa”, “Avenida Santa Fe” (with Jacinto Alí), “De aquel carnaval” (with Ángel Di Rosa), “Ufa terminala” (with Enrique Dizeo), “Un cielo azul cariño” (with Daniel Lomuto) and “La mía va por Juncal” (with Francisco García).