In a " Gandhar Pancham " ( Imdadkhani, school of Vilayat Khan ) sitar, the bass or kharaj strings are removed and are replaced by a fourth chikari which is tuned to Ga. By playing the chikari strings with this tuning, one produces a chord ( Sa, Sa, Pa, Ga or Sa Sa Ma Ga or Sa, Sa, Dha, Gha depending on the raga ).