In the theater, he played the part of Estragon in Waiting for Godot by Samuel Beckett; recited the monologue "A Terceira Margem do Rio" based on the text by João Guimarães Rosa and, as a reciter, together with the Japanese organist Aya Yoshida, presented the work "Alice au pays de l'orgue" by Jean Guillou for narrator and organ.
Together with the pianist Maximiliano de Brito, Renato Mismetti has performed in the most renowned concert halls in Europe, such as Konzerthaus Berlin, Berlin State Opera, Cuvilliés Theatre, Munich, Gewandhaus, Leipzig, Alte Oper, Frankfurt, Musikhalle Hamburg, Konzerthaus Vienna, Schlosstheater Schönbrunn, Vienna, Salle Gaveau, Paris, St. John's, Smith Square, London, besides the Amazon Theatre Manaus, o Theatro da Paz, Belém and also the Weill Recital Hall at Carnegie Hall, New York.
Various renowned composers such as Marlos Nobre, Jorge Antunes, Almeida Prado, Edino Krieger, Kilza Setti, Ronaldo Miranda, Osvaldo Lacerda, Gilberto Mendes, Ricardo Tacuchian, Violeta Dinescu and Jens Joneleit have dedicated compositions especially to this Brazilian Duo, who presented them to the world for the first time in important historical theaters such as the Markgräfliches Opernhaus in Bayreuth and the Schlosstheater New Palace (Potsdam).
Recently, based on the famous text by Antônio Castro Alves, "Navio Negreiro", the composer Siegrid Ernst, wrote "Memento" in which Renato Mismetti and Maximiliano de Brito, together with other musicians gave the first world performance with huge success.
In recognition of his cultural exchange activities covering various countries, the Apollon Foundation of Bremen, Germany, was included as an associate member of UNESCO's IMC – International Music Council.