Marcelo Silva Barbosa (Portuguese: [baʁˈbɔzɐ]; born April 7, 1975) is a Brazilian guitarist and music teacher.

Besides organizing work and managing other teachers, Barbosa established his own entire approach instead of copying or adapting any already existed one and he wrote all the didactic material.

[3] Barbosa also attended classes and workshops of musicians like Greg Howe, Lula Galvão, Hélio Delmiro, Toninho Horta, Guinga, Ian Guest among others.

[5] They released an EP and a full-length album Novo Dia and they play almost every week at different venues of the capital of Brazil.

In the end of April 2008 the recording of new Almah album Fragile Equality started at Norcal studios (São Paulo) and finished in July 2008.

Some time ago Barbosa wrote a book about technique to the "Toque de Mestre" series, published by HMP.

A number of events are frequently organized by GTR like festivals and workshops with musicians like Sidney Carvalho, Kiko Loureiro, Edu Ardanuy among others.