piano

how many buttons and octave on the piano ?

• 78 buttons and 4 octave

• 65 buttons and 6 octave

• 88 buttons and 7 octave

• 97 buttons and 5 octave

who invented the piano in what year ?

• bartolomeo cristofoli

• Krystian Zimerman

• Alfred Brendel

• Martha Argerich

how is the average weigh of the piano ?

• 130

• 250

• 470

• 300

how many pieces in the piano produced for purposes of voice ?

• 1.000

• 10.000

• 100

• 100.000

how many percentage of piano does it produced by wood ?

• %60

• %40

• %70

• %100

in the past how was made of the piano button ?

• wood

• ivory (elephant teeth)

• pearl

• gold