For a week or so an aerial truck platform thing lumbered like an hydraulic dinosaur around the building where I work. The property owners were either cleaning or painting or treating the stone at the top of the chimneys and stuff. It seemed like important work--important enough to use a SkyLift, exactly as in this image I have stolen off Flickr.
Anyway, at one point the beast was inching its way down the alley outside my office window, all the while sending out its mating call: an E7 beep. And I captured a little of it. At the very end of the recording there is a cool sound of engine noise as well, something very brief but Death Star-ish.
Aerial Truck Platform Backing Up Beep
photo by CovLtwt, used fair 'n' square