Fill in the Blanks The pianoOnline version Fill in the blanks this description of the piano. by Remedios Alberto 1 practice pedals keys hammer strings intensities una grand sustain sharps sostenuto corda upright The piano has 88 . The black keys play and flats . There are two kinds of pianos : the piano and the piano . The keys activate a padded , which strikes the and immediately falls back . Pressing the keys with different strengths produce different . The piano has three , called : ( soft pedal ) , and in grand pianos and una corda , ( or celeste ) and sustain pedal in upright pianos .