The Roland Alpha Juno (and Juno 2) hybrid analogue synthesiser has been used on countless numbers of electronic, pop and dance tracks over the past twenty seven years or so. Perhaps its most famous contribution to the canon of pop sonics is the ‘Hoover’ sound, derived from a patch called ‘What The’, originally created by Eric Persing.  Simon Reynolds rounds up some prominent uses of the sound, and says ‘it’s like a twelve bar blues shuffle in E at this point’. This page gives a little more of the history, and includes links to the Hoover bank of sounds, for your own use!