How do singers sound sans auto-tune? Well, if you’re Freddie Mercury and David Bowie, the answer is pretty damn good. With their isolated vocal track gaining traction, you can listen for yourself to “Under Pressure,” a 1981 song originally recorded by Bowie and Queen. It would later make it to Queen’s 1982 album, ‘Hot Space.’ Sources reveal that the riveting song was created in Switzerland during an improvisational, 24-hour jam session, with is evidenced by much of the scat singing. Listen to the magic moment below.