A "singing string" refers to a type of string that produces sound when it vibrates. This phenomenon occurs when the string is plucked, bowed, or struck, causing it to oscillate and create musical notes. The pitch of the sound depends on the string's length, tension, and thickness. In musical instruments like the guitar or violin, singing strings are essential for producing melodies. The vibrations travel through the air, allowing us to hear the music. Different techniques, such as fingerpicking or arco (bowing), can enhance the sound and expressiveness of the singing string.