This might be kind of a funny question....but a serious one as well.
I'll out myself as a "whistler" right here.....one of these annoying people, who, no matter what they do, they will put it into a rhythm and whistle a tune along with it.
If I have an odd Job to do.....like painting the house, cutting a tenthousand tubes into cm-pieces, or whatsoever, I'll take up a piece of music in my mind, tap the beat, whistle the melody....and off I go, mostly annoying my surrounding workers by time, efficiency and nerve-input.
I actually got sacked from a job once....for demotivating my coleagues by doing this.
Anyhow.....I don't sing, or humm ...I whistle, using my lower Lip as a labium to blow on, and I DO take great care, to do it correctly....concerning intonation, beat and so on........meaning I Do use my mouth/lips as a natural instrument , which could sometimes double a professionally played Piccolo.
Of course I KNOW, I'm doing this......just like a Drummer might be aware of his own constant "beating" and "Tapping" of his legs.....the typical ""Drummers-nervousness""...
but I have never given it a deeper thought, since playing the Sax in former times, there was not too much relevance to it.
But having gotten really serious about the FLUTE now.....I feel that the "Whistling" - Experience, meaning the "feel" of Air towards a Labium....be it Lip or Blow-hole,
does in fact help a VERY great deal.
I seriously play the flute now for merely one and a half years.....but apart of the utmost Highnotes, I have more ease and ability on it , than after 25 Years on the Sax or Clarinet....
meaning , the Flute has overrun other instruments in no time at all, concerning my own abilities.
Now I don't want to get into questions of Talent, Magic or """musical genetics"""

I seriously feel this to be so !!...............
Does anybody else have similar experiences ??
And by the way.... there is a Thread about practicing without the instrument.....could actually "Whistling" be a training-Alternative ?
I'd love to hear Your views about that.....
Benjahmin