Check out the horns from the Acura TL - they sound like the BMW/Porsche horn.

BTW, I was watching one of the Best Motoring videos of the S2000's initial comparison with the competing convertibles - where they showed the top lowering, handling in terms of slalom and body roll etc. The most hillarious part was when they tested the horns! 3 great sounding mature horns followed by the S2000's little "beep beep". I'll try to digitize that clip when I have the time and put it on the web.