>The Vulcan, was that famous Vulcan howl a blue note.<
Not in the musical sense. By ear, the harmonic structure is mostly built up from minor thirds and fifths, and at higher power settings it becomes a dominant minor ninth with added eleventh. The fifth becomes a sharp fourth at high power settings; that's the bit that raises the hairs on the back of your neck. The intake resonance adds various sub-octaves and their harmonics to the mixture.
The chord at the beginning of the Beatles' "Hard Day's Night" is a rough approximation to the underlying harmony.