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 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