Learning to Whistle

Until late last year, I couldn't whistle. At some point I decided this was unacceptable, and I tried for awhile and then I could whistle. So I could whistle for awhile. For the past few months I've been without any music instruments, so the only ways to make noise are singing (ugh), humming (worse), or whistling. I have become fairly proficient at whistling, much to the chagrin, I suppose, of anyone within earshot. Whistling is an excellent complement to walking.