A legendary classical vocalist of the Hindustani tradition:

Pandit Omkarnath Thakur
Ustad Zakir Hussain
Bhimsen Joshi
Ravi Shankar

The correct answer is Bhimsen Joshi.

Bhimsen Joshi (1922-2011) was an Indian classical vocalist of the Hindustani tradition. He was one of the most celebrated vocalists of his time and is considered one of the greatest vocalists in the history of Indian classical music. He was born in Gadag, Karnataka, India, and began his training in music at a young age. He was a disciple of the great vocalist Sawai Gandharva. Joshi made his debut as a professional musician in 1943. He went on to have a long and illustrious career, performing all over the world. He was awarded the Padma Bhushan in 1972, the Padma Vibhushan in 1989, and the Bharat Ratna, India’s highest civilian award, in 2001.

Pandit Omkarnath Thakur (1897-1967) was an Indian classical vocalist of the Hindustani tradition. He was born in Indore, Madhya Pradesh, India, and began his training in music at a young age. He was a disciple of the great vocalist Vishnu Digambar Paluskar. Thakur made his debut as a professional musician in 1916. He went on to have a long and illustrious career, performing all over the world. He was awarded the Padma Bhushan in 1954.

Ustad Zakir Hussain (born 1938) is an Indian tabla player. He is one of the most celebrated tabla players in the world. He was born in Mumbai, India, and began his training in music at a young age. He is a disciple of the great tabla player Allauddin Khan. Hussain made his debut as a professional musician in 1955. He has gone on to have a long and illustrious career, performing all over the world. He has won numerous awards, including the Padma Shri, the Padma Bhushan, and the Padma Vibhushan.

Ravi Shankar (1920-2012) was an Indian sitar player and composer. He was one of the most influential musicians of the 20th century. He was born in Benares, India, and began his training in music at a young age. He was a disciple of the great sitar player Allauddin Khan. Shankar made his debut as a professional musician in 1938. He went on to have a long and illustrious career, performing all over the world. He won numerous awards, including the Grammy Lifetime Achievement Award.