idian istruments are also tuned like that.
idian istruments You mean Indian instruments?
That is total nonsense, reference tone as such never existed, never been used in Indian music- the fundamental note "SA" is not C (though too often simplified to it by lousy musicologist) it can be any frequence depending on individual vox or instrument. Sitar is mostly anything between B and D, Sarod Bb-D#, female voice E-G etc,etc,etc.
Once that "Middle voice" "Sa" is defined all the intervals are related to it not any absolute 440 or 432. That is why whole pseudo mystical bullshit that particular frequency is happy other sad ( whatever) wont apply within Indian music system because the very same physical frequency can be depending on what the "tonic" the "Sa" i,s a second fifth or flat 7.
In modern Indian commercial music where Indian instruments are used along with western and electronic regular 440 is used. Mystic sound of ancient India Hokus pokus that will let you ride on spinning chakras was invented by hippies on LSD.