Wikipedia
Amritavarshini
Amr̥tavarṣiṇi is a rāgam in Carnatic music (musical scale of South Indian classical music). It is an audava rāgam (or owdava rāgam, meaning pentatonic scale). It is a janya rāgam (derived scale), as it does not have all the seven swaras (musical notes).
It is a common pentatonic scale of Carnatic music and is believed to produce rain. It is said that the Carnatic composer Muthuswami Dikshitar brought rain at Ettayapuram, Tamil Nadu, India by singing his composition Aanandaamrutakarshini Amrutavarshini.