"Open String" is the string on a stringed musical instrument that produce their natural pitch when played without pressing them down on the fingerboard or fretboard. Various stringed instruments, including the violin, viola, cello, double bass, and guitar, feature open strings. The specific open strings and their pitches vary depending on the instrument.
Here are examples of open strings in common stringed instruments, listed from low to high:
Open strings serve various musical purposes. They can be employed to create specific timbres, provide resonance, and infuse brightness into musical passages. Open strings are also essential for tuning purposes and serve as reference pitches for musicians.