Because of his versatility, João Gaspar became a renowned sideman and have shared the stage and/or recorded with many important names of the international music, such as Ivan Lins, Maria Bethânia, Simone, Zélia Duncan, Jorge Vercillo, Maria Rita, Lenine, Hamilton de Holanda, Daniela Mercury, Milton Nascimento, Leo Gandelman, Mart'nalia, Frejat, Daniel Boaventura, Isabella Taviani, Angela Ro Ro, Taryn Szplilman, Roberta Campos, Eduardo Dussek, Guinga, Zeca Baleiro, Rita Ribeiro, Carlos Malta, Eugenia Leon (Mexico), Tunai, Zé Ramalho, Ney Matogrosso, Simone Guimarães, Arthur Maia, Josee Koning (Holland), Daniel Gonzaga, Cláudio Lins and Naná Vasconcelos.
João has released albums with his own compositions over the years and in 2023 he starts a new international venture by releasing the album "Acoustic Landscapes: Resonator" by XpandMusic (Los Angeles, CA).