This is no ordinary music lesson. The familiar out of the unfamiliar… “weird and wonderful things”… a magician pulling sounds out of the air.. .a heightened sense of physical principles and possibilities — all of these, and more are at play in “The Clarinet, The Washtub, And The Musical Nails: How Musical Instruments Work.” Physicist Robert Greenler uses an eclectic set of materials and an abundance of spontaneous humor to explore the basic elements in the creation of music.