How many singers can we think of who use two mics onstage? It's usually a special effect, like normal and lo-fi, or dry and processed. I have three to start us off. Les Claypool uses what looks like a small-diaphragm condenser for his hi-fi mic, and a green bullet for the lo-fi stuff. He changes his voice by switching back and forth. He has carried this setup through from Primus to the Delirium. Ellie Rowsell of Wolf Alice uses a similar setup, a Sennheiser dynamic for the "normal" stuff and a bullet mic for the lo-fi screaming. I read a quote from her somewhere that she started doing it as a cheap-and-dirty way to vary her vocal sound back when they were playing clubs, and she's just kept doing it now that they're playing big places. Matt Johnson with The The. His song "Good Morning, Beautiful" from the Mind Bomb album was a conversation between Jesus and the devil, and Johnson performed both parts live using two different mics, the the "devil" one heavily processed. Who else uses this simple but effective way to change up their vocals?