Natyashastra
तत्रोपरि यथा ह्येकः स्वरो वैणस्वरान्तरे । प्राप्नोत्यन्यत्वमेवेह तथा वंशगतोऽपि हि ॥ ३ ॥
Just as one note on the Vīṇā transforms into another, similarly, a note of the flute also changes into a different one.
english translation
tatropari yathA hyekaH svaro vaiNasvarAntare । prApnotyanyatvameveha tathA vaMzagato'pi hi ॥ 3 ॥
hk transliteration by Sanscript