Born in July 30, 1976 in Rio de Janeiro State, Brazil, Cassio Vianna began studying piano at age nine and composing at age twelve. Starting as a classical pianist, Cassio moved to pop music at age thirteen, as he joined a Christian band in his hometown, São Gonçalo. Around that same time, his interest in jazz and Brazilian jazz started to grow as he discovered the music of Milton Nascimento, Francis Hime, Elis Regina, Cesar Camargo Mariano, Ivan Lins, Tom Jobim, Chico Buarque, Chick Corea and Pat Metheny. He studied jazz piano with Maria Lidia Fernandes and Delia Fischer, and harmony with the Hungarian teacher Ian Guest. In 2003, Cassio received his Bachelor's Degree in Music at Universidade Federal do Estado do Rio de Janeiro (Uni-Rio). In 2009, he moved to the USA, and received his Master's Degree in Contemporary Music at Western Oregon University in 2011.