Madhu Iyer is an Indian playback singer. She has recorded songs for films and albums in various Indian languages and has established herself as a known playback singer of South Indian cinema. Madhu aspired to become a playback singer from an early age. At the age of four, she started performing on stages. Apart from playback singing, Madhu performs in musical concerts around the world. She also appears in music videos. She produces her own music videos and teaches Carnatic music.

Kalaga Thalaivan is a 2022 Indian Tamil-language action thriller film directed by Magizh Thirumeni and produced by Udhayanidhi Stalin under the banner of Red Giant Movies. The film stars Udhayanidhi, Arav, Nidhhi Agerwal and Kalaiyarasan. The music and background score were composed by Srikanth Deva and Arrol Corelli, while the cinematography and editing were handled by K. Dhillraj and N. B. Srikanth. This is the fourth collaboration of N. B. Srikanth and Magizh Thirumeni after Thadaiyara Thaakka, Meaghamann and Thadam.