7. 'Under Pressure'
David Bowie stopped by Switzerland's Mountain Studios during the recording of Queen's 1982 LP Hot Space to sing background on a "Cool Cat." During the session, the four members of Queen and Bowie started jamming on a new song built around a killer bass groove. The result was "Under Pressure," which came out in October 1981 and became a global sensation. It remained in Queen's set list through the end of their live career, and Bowie played it all through the 1990s and early 2000s. Sadly, they never played it together, even though they performed back-to-back sets at Live Aid in 1985.