After such a powerful negative reaction, Veloso was unsure whether to appear in the second round on 15 September, but his manager convinced him to go on, and this chaotic performance was recorded live and later released as a single. The students in the audience began hissing as soon as Veloso's name was announced, even before he had even taken the stage. Wearing the same green costume (minus the wires and necklaces), Veloso came on with Os Mutantes amid a storm of catcalls, and the group launched into a provocative new song Veloso had written for the occasion, "É Proibido Proibir" ("It is Forbidden to Forbid"), the title of which he had taken from a photo of a Parisian protest poster, which he had seen reproduced in a local magazine. The booing and jeering was soon so loud that Veloso struggled to be heard over the din, and he again deliberately taunted the leftists with his sexualised stage actions. Within a short time the performers were being pelted with fruit, vegetables, eggs and a rain of paper balls, and a section of the audience expressed their disapproval by standing up and turning their backs to the performers, prompting Os Mutantes to respond in kind by turning their backs on the audience. Infuriated by the students' reaction, Veloso stopped singing and launched into a furious improvised monologue, haranguing the students for their behaviour and denouncing what he saw as their cultural conservatism. He was then joined by Gilberto Gil, who came on stage to show his support for Veloso, and as the tumult reached a crescendo, Veloso announced he was withdrawing from the competition, and after deliberately finishing the song out of tune, the Tropicalistas defiantly walked offstage, arm-in-arm.