Why? Well, something in our brain's aural processing seems to think that an off-beat staccato is more pleasing than a steady one. Ask any Harley lover, or listen at the fence when a MotoGP Ducati or cross-plane crank Yamaha streaks past. The smooth sound of a passing fighter jet may sound impressive but it doesn't get to your groin like the thundering music of a P-51 Mustang. As it turns out, YouTube guy roadracenut has put together a musical and visual explanation of how the VFR makes its beautiful noise. Enjoy....