Following the Brazilian military coup of 1964, Buarque avoided censorship by using cryptic analogies and wordplay. For example, in the song "Cálice" ("Goblet"), a duet written in 1973 with Gilberto Gil and released with Milton Nascimento in 1978,[11] he takes advantage of the homophony between the Portuguese imperative "shut up" --cale-se—and "goblet" --cálice—to protest government censorship, disguised as the Gospel narrative of Jesus' Gethsemani prayer to God to relieve Him of the goblet of probation. The line "I wanna sniff diesel fume" is a reference to the death of political prisoner Stuart Angel, who reportedly had his mouth glued to a jeep's exhaust pipe during a torture session.[12] Buarque was close to Stuart's mother, Zuzu Angel.