Each note on the piano makes a specific sound due to standing waves. To understand resonance, it is important to understand why a stretched string makes a specific note. When the vibration from one object causes another object to vibrate, it is called resonance. When you stop singing, you can hear the piano sounding the same note. If you press the sustain/damper pedal on a piano and sing a note, the strings in the piano that make the same note that you sing will vibrate. If the dampers were not in place, the piano would softly repeat any sound that comes in contact with it. It’s important for the piano to have dampers so that the piano strings can be kept quiet.
The sustain/damper pedal lifts all the dampers at the same time to allow the strings to vibrate freely and the notes to keep sounding after you take your finger off the key.
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