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The number of keys on a piano can vary depending on the type of piano. 

A standard acoustic piano, commonly known as a "full-size" or "88-key" piano, typically has 88 keys. These keys span seven octaves plus a minor third, from A0 to C8.

However, there are other types of pianos with different numbers of keys. For example, some smaller or electronic keyboards may have fewer keys, such as 61 keys or 76 keys, while larger concert grand pianos may have more than 88 keys.

 

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The number of keys on a piano can vary depending on the type of piano. 

A standard acoustic piano, commonly known as a "full-size" or "88-key" piano, typically has 88 keys. These keys span seven octaves plus a minor third, from A0 to C8.

However, there are other types of pianos with different numbers of keys. For example, some smaller or electronic keyboards may have fewer keys, such as 61 keys or 76 keys, while larger concert grand pianos may have more than 88 keys.

But in general, when referring to a standard piano, it has 88 keys.
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