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 The most common whistles can easily play notes in the keys of D and G major. Since the D major key is lower these whistles are identified as "D whistles." The next most common whistle tuning is a "C whistle," which can easily play notes in the keys of C and F major. The D whistle is the most common choice for Irish and Scottish music. Although the whistle is essentially a diatonic instrument, it is possible to get notes outside the principal major key of the whistle, either by "half-holing" (partially covering the highest open finger hole) or by