This harp is tuned diatonically over five octaves. Arumba refers to a set of diatonically tuned bamboo xylophones, often played by women. The strings are tuned diatonically, to a major or minor pentachord. The Hugh Tracey kalimbas are tuned diatonically in the key of G. Initially instruments were diatonically tuned, having some 32 strings. This type of slash chord contains diatonically occurring notes. Variants of the tone cluster include chords comprising adjacent tones separated diatonically, pentatonically, or microtonally.