What is "hamsadhvani"

Hamsadhvani (meaning Sound of Swans) also spelled as Hansadhwani, is a rāga in Carnatic music (musical scale of Carnatic tradition of Indian classical music). It is an audava rāgam (or owdava rāga, meaning pentatonic scale). It is a janya rāga (derived scale), as it does not have all the seven swaras (musical notes).

Hamsadhvani is also extensively used in Hindustani music and said to be borrowed into it from Carnatic music. It was created by the Carnatic composer Ramaswami Dikshitar (1735–1817) and brought into Hindustani music by Ustad Aman Ali Khan of the Bhendibazaar gharana.