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 whistle it will be written an octave lower than it sounds, to spare ledger lines and make it much easier to read. The traditional music of Ireland and Scotland constitutes the majority of published scores for the whistle. Since the majority of that music is written in D major, G major, or one of the corresponding musical modes, use of the D major or G major key signatures is a "de facto" standard. For example, the "C whistle" edition of Bill Ochs's popular "The Clarke Tin Whistle Handbook" is scored in D and differs from the D edition only in