It's not a great idea to whistle or sing at work in the office--except after hours. When I work late and everybody else is gone, I whistle and sing most of the time-whatever comes into my head.

And I do sing (and have also whistled--(theme from The Good the Bad and the Ugly and She's Only A Bird in a Gilded Cage--the ones I used to whistle to the parrot that used to be in my house)--- in the stairwell going up to lunch--great acoustics--I can't imagine taking the elevator instead.

When I leave at the end of the day I sing Bury Me Not On The Lone Prairie (Joe Hickerson's version)--since its 9 1/2 verses get me just about exactly into the subway.

And I do sing walking from home to and from the subway--it's 4 long songs or 5 short songs to the subway. I sing according to the weather. Good weather-- C & W. Misty and rainy--Irish. Real blustery--sea songs. Unless there's a particular song I really want to learn--then I sing that all the way.

I also try to whistle to imitate birds I hear along the way--mostly cardinals--they're easy to mimic.

Used to sing Gibert and Sullivan and musicals--My Fair Lady--(especially the aggressive ones--e.g. "Just You Wait, 'enry 'iggins)--, Camelot, Music Man while mowing lawns--eons ago when I had a lawn-mowing job. Now I hum along with Vivaldi or Handel while doing taxes.