Tamil,an Indian playback singer in Hindi, Tamil, Malayalam, Kannada and Telugu movies, an established ghazal singer, and one of the pioneers of Indian fusion music. In 2004, he was awarded the prestigious Padma Shri and Yesudas Award for his outstanding performance in music.

Hariharan is the correct answer. He is Tamil, a multilingual playback singer across Hindi, Tamil, Malayalam, Kannada, and Telugu, an established ghazal singer, and pioneered Indian fusion music as part of Colonial Cousins. He received Padma Shri in 2004. Jagjit Singh was primarily a ghazal singer, not a fusion pioneer. Kumar Sanu and NFA Khan don't match the fusion music pioneer description.