When David Bowie and Freddie Mercury came together to record "Under Pressure" in 1981, the result was one of the best duets of all time. Though the recording process managed to unite some of the most prolific musical geniuses of the 20th century, creating the masterpiece was no simple task. "Under Pressure" was a song that, like its namesake implies, was produced under pressure. Performed alongside Queen creative masterpieces like "Bohemian Rhapsody," the song became a staple at concerts and appeared on Queen and Bowie albums alike. Creative differences and clashing personalities tested the limits of music-making, but the tension between the singers also made "Under Pressure" a landmark collaboration