Omar Cavalheiro played in the Celebration Internacional de Varadero (Cuba/1981) with Chico Buarque, MPB-4, Nara Leão, yet others. He participated in the Free of charge Jazz Celebration (1988) using the Orquestra de Música Brasileira. Cavalheiro also was an associate from the Orquestra de Cordas Brasileiras, which gained the Sharp award as greatest record (1991 and 1992) and greatest instrumental group (1991). He spent some time working for performers like Elza Soares, MPB-4, Francis Hime, Zé Renato, and Leila Pinheiro. He provides participated on many albums, including Retratos (Radamés Gnattali), Noites Cariocas (Reside in the Municipal Movie theater, Rio), Álbum Musical (Francis Hime), Sílvio Caldas 90 Anos (Zé Renato and orchestra), Piazzolando Ao Vivo (Daniel Binelli), and Bach in Brazil (Camerata Brasil), the last mentioned appointed best record in the month of July 2000 by Common Compact disc (Londres). He was also an associate from the Camerata Brasil and of the Novo Quinteto, an instrumental group produced with former associates from the Quinteto Radamés.