answers: 88
context: Piano pedals Piano pedals are foot-operated levers at the base of a piano that change the instrument's sound in various ways. Modern pianos usually have three pedals, from left to right, the soft pedal (or una corda), the sostenuto pedal, and the sustaining pedal (or damper pedal). Some pianos omit the sostenuto pedal, or have a middle pedal with a different purpose such as a muting function also known as silent piano. The development of the piano's pedals is an evolution that began from the very earliest days of the piano, and continued through the late 19th century. Throughout the </s> layouts of this 30-button variety are the Jeffries and Lachenal systems. Layouts with 36, 38 and 40 buttons are not uncommon, and a few anglos have as many as 55 keys (such as the one John Spiers plays). Instruments in the key of C/G are most typical. Other key combinations are also available—G/D and B/F being the most common alternatives. B/F and A/E were popular with the Salvation Army. The Anglo concertina is typically held by placing the hands through a leather strap, with the thumbs outside the strap and the palms resting on wooden bars. This arrangement leaves four </s> gradations of volume and tone according to how forcefully a performer presses or strikes the keys. Most modern pianos have a row of 88 black and white keys, 52 white keys for the notes of the C major scale (C, D, E, F, G, A and B) and 36 shorter black keys, which are raised above the white keys, and set further back on the keyboard. This means that the piano can play 88 different pitches (or "notes"), going from the deepest bass range to the highest treble. The black keys are for the "accidentals" (F/G, G/A, A/B, C/D, and
question: how many keys on a concert grand piano