I like playing the piano which was invented in Italy
Awesome!  Who was it that invented it?
Bartolomeo Cristofori was the inventor of the piano.
I've always wondered how many black keys and white keys were on a piano - do you happen to know?
I don't actually know how many keys but they work by having a hammer strike the strings of the piano.
That's interesting!  When was the piano invented?  I bet it was a long time ago!
Piano
The piano is an acoustic, stringed musical instrument invented in Italy by Bartolomeo Cristofori around the year 1700 (the exact year is uncertain), in which the strings are struck by hammers. It is played using a keyboard, which is a row of keys (small levers) that the performer presses down or strikes with the fingers and thumbs of both hands to cause the hammers to strike the strings. 
The word piano is a shortened form of "pianoforte", the Italian term for the early 1700s versions
used the keys of the piano as an image of racial harmony:
I don't care what you know; show me what you can do. Many of my people who get educated don't work, but take to drink. They see white people drink, so they think they must drink too. They imitate the weakness of the white people, but not their greatness. They won't imitate a white man working hard ... If you play only the white notes on a piano you get only sharps; if only