For this brief video, a mouthpiece and vinyl tubing have been combined to illustrate some basic principles regarding the generation of musical notes. It reminds me of the unusual musical creations of Gerard Hoffnung, who commissioned the "Grand, Grand Overture" by Malcolm Arnold (scored for three vacuum cleaners and an electric floor polisher). One instrument Hoffnung devised was the "hosepipe" - a mouthpiece attached to a garden hose.
And a hat tip to Yucatanstan [nice name!] for identifying the instructor as Dr. John Winkler, Professor of Trumpet at West Virginia University's College of Creative Arts.