Talking and singing produce respiratory droplets and aerosols. See https://www.lesswrong.com/posts/Jnq2A7A7ytgttQ5Ek/covid-transmission-by-talking-and-singing

Talking and singing produce respiratory droplets and aerosols. See https://www.lesswrong.com/posts/Jnq2A7A7ytgttQ5Ek/covid-transmission-by-talking-and-singing https://www.lesswrong.com/posts/Jnq2A7A7ytgttQ5Ek/covid-tran... and the references cited therein.