Amir Khusro was a 13th-century Sufi poet, musician, and scholar who contributed to Indian classical music and literature, but the sarod as an instrument developed much later (around the 19th century) and is not associated with him. The other pairings are correct: Bhim Sen Joshi was indeed a renowned vocalist, Utpal Dutt was a legendary film and theater actor, and Shambhu Maharaj was a Kathak exponent.