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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.
About the same, maybe a little easier. Piano uses all 10 fingers, and harp only uses 8. On piano, you have to understand more theory about when to use the black keys than you do on harp, which uses levers or pedals that often donât change through an entire song.