Tin whistle all the holes closed, the whistle generates its lowest note, the tonic of a major scale. Successively opening holes from the bottom upward produces the rest of the notes of the scale in sequence: with the lowest hole open it generates the second, with the lowest two holes open, it produces the third and so on. With all six holes open, it produces the seventh. As with a number of woodwind instruments, the tin whistle's second and higher registers are achieved by increasing the air velocity into the ducted flue windway. On a transverse flute this is generally done by
Tin whistle made of brass tubing, or nickel plated brass tubing, with a plastic fipple (mouthpiece). Generation, Feadóg, Oak, Acorn, Soodlum's (now Walton's), and other brands fall in this category. The next most common form is the conical sheet metal whistle with a wooden stop in the wide end to form the fipple, the Clarke's brand being the most prevalent. Other less common variants are the all-metal whistle, the PVC whistle, the Flanna square holed whistle, and the wooden whistle. Gaining popularity as a folk instrument in the early 19th century in the Celtic music revivals, penny whistles now play an integral