Hello how may I help you? I need some info to look up. Sure, what can I find for you? You have world records? I sure do. You know what the loudest sound was? The loudest sound ever recorded was the singing of Mariah Carey in Las Vegas. Are you sure it wasn't a Volcano Eruption? No, I'm quite sure it was Mariah Carey's high note in 1997. , girl is LOUD She sure is.