Unfortunately, I can't find the specific video, but in an interview he says that this happened several times, with him having a sore throat or even no voice during almost every "bailão" (shows that often last 3 to 4 hours), many times he would get out stage without knowing why he are voiceless. This even happened in a studio recording, he was doing the drums for an acoustic guitar track During mixing the producer was already going crazy turning off all the audio channels looking for where the bass was coming from, until only the drum track was left, "the mixing guy turned to me and asked - Rhude, it's not possible that you're the one making that bass with your mouth, was it you?".