Tin whistle of which tone holes the player should cover. The most common format is a vertical column of six circles, with holes to be covered for a given note shown filled with black, and a plus sign (+) at the top for notes in the second octave. Tablature is most commonly found in tutorial books for beginners. The tonic solfa is found in Ireland and possibly Wales, especially in schools. Many schools have printed sheets with tunes notated in tonic solfa, although in Ireland more have teaching by note. With the availability of good standard notation tutor books, teaching is possibly
Tin whistle 20th century, and also featured a brass tube with a lead fipple plug. The design was updated somewhat over the years, most notably the substitution of a plastic fipple for the lead plug design. While whistles have most often been produced in higher pitches, the "low" whistle is not unknown historically. The Museum of Fine Arts, Boston has in its collection an example of a 19th-century low whistle from the Galpin collection. During the 1960s revival of traditional Irish music the low whistle was "recreated" by Bernard Overton at the request of Finbar Furey. The most common whistles today are