Harmonized based on the scale of notes Raga Hamsadhwani. Hamsadhwani scale has the notes of the major scale except the 4th and 6th. Other scale notes have been sung, random reharmonizations exist… Sung in C, the C major 9th chord has all the scale notes of the raga.
("Prabhatha kaale" means "In the morning"? This recording was made in the early morning light.)