The Carnatic classical vocalist and first ever musician to receive the Bharat Ratna award, also known as ‘Queen of songs’, is _________.

The correct answer is MS Subbulakshmi.

Step-by-step Explanation:
1. Identify the Musician: Madurai Shanmukhavadivu Subbulakshmi, popularly known as M.S. Subbulakshmi, was a legendary Carnatic classical vocalist.
2. Bharat Ratna Award: In 1998, M.S. Subbulakshmi became the first musician ever to be awarded the Bharat Ratna, India's highest civilian honor.
3. ‘Queen of Songs’: She was famously referred to as the "Queen of Music" or "Queen of Songs" by prominent figures, including India's first Prime Minister, Jawaharlal Nehru, who once said, "Who am I, a mere Prime Minister, before a Queen, a Queen of Music?"
4. Conclusion: Therefore, the Carnatic classical vocalist who was the first musician to receive the Bharat Ratna award and is also known as the "Queen of songs" is M.S. Subbulakshmi.