An image of a man playing grand piano and below this image, the following text is written: Grand piano: Pianos can be upright or, like this grand, horizontal. A grand piano makes a rich and powerful sound. An illustration of a piano explains various parts of the piano as:

• Bridge: Each string passes over a curved piece of wood called a bridge, which transmits the string’s vibrations to the soundboard.
• Cast iron frame: This rigid frame is strong enough to allow huge force to be exerted on the strings.
• Bass bridge
• Key
• Damper
• Treble strings: Short, thin strings produce higher pitches.
• Bass strings: Long, thick strings produce lower pitches. The bass strings cross over the mid-range strings to use space efficiently.
• Pins for tuning
• Soundboard: Made from a large, thin piece of wood (usually spruce), the soundboard resonates and amplifies the sound from the vibrating wires.

Another illustration shows a keyboard's inside tools, such as wire string, damper, felt-tipped hammer, interconnected levers, key, pivot, and damper lever. The following text is written beside this illustration: Keyboard action: As a key is pressed down, the section beyond the pivot moves up. This activates a series of levers that flick a hammer upward to strike the string and make it vibrate. The damper is released, which allows the string to continue vibrating.