"Under Pressure" is a 1981 song by Queen and David Bowie. It marked Queen's first released collaboration with another recording artist, and is featured on their 1982 album Hot Space. The song was a hit at the time, reaching #1 in the UK singles chart.
Bowie had originally come to the studios in order to sing backing vocals in another Queen song, "Cool Cat", which would end up being edited out since he wasn't satisfied with them. Once he got there, they jammed for a while and wrote the song.