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Seven white keys and five black keys form an octave. As you already know, now pianos have 88 keys, that is, 7Â¼ octaves. As a rule, there are 52 white keys and 36 black keys on a regular piano. However, not only standard 88 key pianos are used now. Some well-known piano makers produce instruments with different number of keys. For example, there are 92 of them in BÃ¶sendorfer 225, and even 97 keys in BÃ¶sendorfer 290.
Piano, also called pianoforte, French piano or pianoforte, German Klavier, a keyboard musical instrument having wire strings that sound when struck by felt-covered hammers operated from a keyboard. The standard modern piano contains 88 keys and has a compass of seven full octaves plus a few keys. The vibration of the strings is transmitted to a soundboard by means of a bridge over which the strings are stretched; the soundboard amplifies the sound and affects its tone quality.