the piano or a pedal harp or concert harp
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The piano is an instrument that has keys, pedals and strings. The keys are strings vibrate when they are struck by hammers being triggered when the keys are pressed. The pedals are used to manipulate the sound in various ways.
No, a saxophone has keys like other woodwind instruments. Brass instruments have valves.
A piano has strings, pedals and keys. The keys are the black and white rectangles at the front of the piano. The pedals are found where the player's feet rest when sat on a stool. They are at the bottom of the piano, and usually in the middle of the piano. There are usually three pedals. The strings are hidden by the top of the piano, but as each key is hit, it connects with the string to make the note. It could also possibly be the harp. The traditional harp (lever harp) has about 30-35 strings. When needing to add flats or sharps to the key signature you flip a little lever that goes with that note. But it can only have three flats and two sharps so they came out with the pedal harp. Which has about 45-50 strings and has a pedal for each note(A, B, C, D, E, F, G). If you push the pedal, it will either make it sharp, flat, or natural.
There are around forty-six (46) strings on the harp, depending on what type it is and seven (7) pedals.
There are many different sizes and styles of harp. Typically the larger ones, like in a symphony orchestra, do have pedals while smaller ones do not. The pedals facilitate a wider range of notes than what you could get without them.