Question

How many key are there in musical instruments??​

Answer 1

Answer:

Harpsichords often extended over five octaves (61+ keys) in the 18th century, while most pianos manufactured since about 1870 have 88 keys. Some modern pianos have even more notes (a Bösendorfer 290 "Imperial" has 97 keys and a Stuart & Sons model has 108 keys).

Answer 2

Depends on the instrument