I've never been particularly effective at whistling. Some people can't whistle -at all-, I produce a shallow 'blowy/breathy' whistle, which has about 1/4 of an octave range. That article describes the ...

I'm not so sure that whistling while you work is such a good idea. I used to whistle "Cherry Pink and Apple Blossom White" all the time in the biology lab. I liked the way the fourth note hung out ...