Who whistles any more? More pointedly, who whistles with a seriousness that entails practice?
A quick zip around Google suggests it's still out there, but the art and artifice has lost its social inroads.
One thing that came up in the Google tour that was sort of fun was this: Why Do People Whistle.
I remember being taught by a fellow student, a Mexican chum, how to whistle loudly for a cab. It took a while to perfect and a lot of saliva dribbled down my fingers, but eventually I caught on. I never did learn how to expel classical music with whistles.
Ah, the lost arts.