Walter Smetak has been played on NTS in shows including Dactylian & Palo Santo Discos, featured first on 14 September 2020. Songs played include Tijolinhos, Material De Construção “Audição Espontânea Do Silêncio, Violão Eólico”, Oficio and Convite.

Walter Smetak was born in 1913 in Switzerland and died in 1984 in Brazil. He was a cellist, composer, inventor, playing and conducting music by instruments he invented. Smetak was deeply involved in the Brazilian music scene collaborating with Gilberto Gil, Tom Zé, Uakti and others.