Editing Sympathetic string (section)

==Sympathetic string resonance in music instruments==
{{main|String resonance (music)}}
Strings or parts of strings may resonate at their [[Fundamental frequency|fundamental]] or [[harmonic]] frequencies when other strings are sounded. In general, non-played strings respond in sympathy to other strings being played. Two tones of the same [[Pitch (music)|pitch]] will give maximum sympathetic resonance as all harmonics of both strings will overlap. Other harmonic combinations will cause sympathetic resonance at the fifth, fourth and major third. 

For example, an A string at 440&nbsp;Hz will cause an E string at 330&nbsp;Hz to resonate, because they share an [[overtone]] of 1320&nbsp;Hz (3 x 440 = 4 x 330 = 1320; third overtone of A and fourth overtone of E).

===Tuning===
The musician retunes the sympathetic strings for each [[Musical mode|mode]] or [[raga]], so that when the corresponding note (or one an octave below it) is played on the main strings of the instrument, the sympathetic strings (called ''tarabs'' in [[Music of India|Indian music]]) will vibrate in response, providing a lingering halo of sound.