This is a recording of a natural gas furnace for a home air heating system. Rode k2 microphone pointed at the piolet light of the furnace about 3 inches away.
Choro polca "Massada", composed by Lulu Cavaquinho (Luiz Carlos dos Santos), recorded in 1911 by Choro Carioca (Pixinguinha: Flute; Irineu de Almeida: Bombardino and Oficleide; Bonfiglio Oliveira: Piston; Leo Viana and Otávio Viana: guitars; Henrique Viana: Cavaquinho)