Two-tone Block

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The Two-Tone Block is a percussion instrument used in bands. Each wooden, cylindrical side is hollowed out, and tuned to a different pitch. This is similar to the tuned Chinese temple blocks. When played with a wooden beater, the two-tone block gives a bright and penetrating sound with a certain hollowness not found in claves.

Family
Percussions
Pitch range
None.
Material
Wood, usually teak.
Size
Variable.
Origins
Two-tone blocks became known through early jazz music. New bands - often composed of amateurs and street musicians - used two-tone blocks as a cheaper alternative to temple blocks, which, because they were imported from China, were often too expensive.
Classification
Idiophone: an instrument that produces its sound through the use of the material from which it is made, without needing strings or a stretched skin.
And also...
Composers have used two-tone blocks to imitate a variety of effects from horses' hooves to a dripping tap and a ticking clock.

picture of Two-tone Block