There's a little uncertainty here. A piano has strings, which a string instrument would have, but it's struck by hammers, which would also make it a percussion instrument.
piano is a common singular noun
Piano is tuned in the key of C
The highest musical note that can be played on a standard piano is typically the C8 note, which is the 88th key on the piano keyboard.
Sic 3931 musical instruments
All of the can be played on piano and have piano acompaniements.
he played piano.
when you strike a piano key you get a musical note out of the piano.
An upright piano.
The piano tuna
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a piano forte is a musical insrument go to an expert to see how it is played
You are a piano key.