In 2003, Walace Mariano began his studies at the Claudio Santoro Cultural Center in Manaus, Brazil, under the guidance of Mauricio Silva and Miroslava Krastanova. Four years later, he moved to São Paulo in order to study at the Baccarelli Institute with Sergio de Oliveira. There, he joined the Academic Orchestra as well as the Symphony Orchestra of Heliópolis. He also studied at the São Paulo State Music School with Pedro Gadelha, who still contributes to his development as a musician.

Walace took part in several music festivals, such as the Londrina Music Festival, Música nas Montanhas [Music on the Mountains], and Campos do Jordão Music Festival. He got the first prize at the 14th Paulo Bosísio National Competition for Strings. He took courses with Ana Valeria Poles, Massimo Giorgio, Waldir Bertipaglia, Chistine Hoock, Esko Laine, Peter Puhn, Ira Gold, and Michael Rieber. In 2011, he perfected his music abilities undertaking masterclasses in Austria with Ernst Weissensteiner (Vienna Symphony), and in Germany, with Cristian Braica (Frankfurt Radio Symphony).

Before joining the Minas Gerais Philharmonic Orchestra, he was part of the Fukuda Camerata, the Bachiana Philharmonic, the Academic Orchestra of São Paulo, and the Experimental Repertory Orchestra. He was also member of the São Pedro Theater Orchestra, where he performed as Principal Double bass in seasons 2013-2015.