More on chromatic scale from Fact Monster:

• trombone - trombone trombone [Ital.,=large trumpet], brass wind musical instrument of cylindrical bore, twice ...
• harp - harp harp, stringed musical instrument of ancient origin, the strings of which are plucked with the ...
• key, in music - key. key. 1. In music, term used to indicate the scale from which the tonal material of a given ...
• harmonica - harmonica. harmonica. 1. The simplest of the musical instruments employing free reeds, known also ...
• organ: Early Organs - Early Organs Ktesibios of Alexandria, in the 3d cent. B.C., invented the hydraulis, in which water ...

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