Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.Sympathetic strings or resonance strings are auxiliary strings found on many Indian musical instruments, as well as some Western Baroque instruments and a variety of folk instruments. They are typically not played directly by the performer (except occasionally as an effect) only indirectly through the tones that are played on the main strings, based on the principle of sympathetic resonance. The effect is most often heard when the fundamental frequency of the string is in unison or an octave lower or higher than the catalyst note, although it can occur for other intervals, such as a fifth, with less effect.