Question: Madhup Mudgal is an Indian Hindustani classical music vocalist, and is a disciple of who, which was a Hindustani classical singer, well known for his unique vocal style and his refusal to be bound by the tradition of any gharana?

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Madhup Mudgal: Madhup Mudgal is an Indian Hindustani classical music vocalist., known for his khayal and bhajan renditions.  A disciple of Kumar Gandharva, he is also a composer, conductor and has been principal of the Gandharva Mahavidyalaya, Delhi, a music and dance school since 1995.

Anjanibai Malpekar: Anjanibai Malpekar (22 April 1883 – 7 August 1974) was a noted Indian classical singer, belonging to the Bhendibazaar gharana of Hindustani classical music.  She was a disciple of Ustad Nazeer Khan of the gharana, with whom she started training at age 8.  She made her professional debut at age 16 in Mumbai, where she spent the rest of her life.  She had a flourishing music career, till 1920, when after death of her guru, she moved away from public performances, eventually retiring from public after 1923.  Thereafter she focussed on training her music disciples, notably Kumar Gandharva and Kishori Amonkar.

Vishwanath Rao Ringe: Late Pt.  Vishwanath Rao Ringe 'Tanarang' born on 6 December 1922 was a Hindustani Classical Music vocalist and composer.  He belonged to Gwalior Gharana of Hindustani Classical Music.  He composed more than 2000 bandishs in about 200 ragaas, for which he has been enlisted in Limca Book of Records.  He wrote couple of books in past named 'Sangitanjali' and 'Swaranjali' and a recent book `Aacharya "Tanarang" ki Bandishen` was published.

Suman Ghosh: Pandit Suman Ghosh is an internationally acclaimed Hindustani Classical Vocalist of the Mewati Gharana of Hindustani Classical Music and a torch-bearing disciple of Sangeet Martand Pandit Jasraj.  He is the founder and President of the Center for Indian Classical Music of Houston (CICMH).

Saraswati Rane: Saraswati Rane (October 4, 1913 - October 10, 2006) was an Indian classical singer in the Hindustani Classical genre.  She was a daughter of Ustad Abdul Karim Khan (1872–1937), the founder of Kirana Gharana.  Her family had a long and great music tradition.  She got her initial training of vocal music of the Kirana Gharana style from her elder brother Sureshbabu Mane and elder sister Hirabai Barodekar, who themselves were the doyen of Indian classical music of their times.  Later she also sang along with elder sister, Hirabai Bododekar, especially in "jugalbandi" style.

Mani Prasad: Pandit Mani Prasad is an Indian vocalist in the Hindustani classical tradition.  An exponent of the Kirana Gharana (school) of Hindustani Classical Music, he is renowned for his purity in the "khayal" form of singing, as well as for his popular renditions of devotional music ("bhajans" and "abhangs").  He is known to have made many new Ragas and given new dimensions to existing ones under his collection, Dhyan Rang Piya.

Shankar Ghosh: Pandit Shankar Ghosh (1935 – 22 January 2016) was an Indian tabla player from the Farukhabad gharana of Hindustani classical music.  He was an occasional Hindustani classical singer where he followed the Patiala gharana.

Chhannulal Mishra: Pandit Chhannulal Mishra (Hindi: पंडित छन्नूलाल मिश्रा ) (born 3 August 1936) is a Hindustani classical singer from Banaras, a noted exponent of the Kirana gharana (school) of the Hindustani classical music and especially the Khayal and the 'Purab Ang' – Thumri.

Subhra Guha: Subhra Guha (born 1956) is a vocal musician in the Indian Hindustani classical music tradition who has trained in the Agra gharana style of singing.  Her repertoire covers khayals, thumri and dadra.

Kumar Gandharva: Kumar Gandharva or Shivaputra Siddharamayya Komkalimath (pronunciation:] (8 April 1924 – 12 January 1992) was a Hindustani classical singer, well known for his unique vocal style and his refusal to be bound by the tradition of any gharana.  The name "Kumar Gandharva" is a title given to him when he was a child prodigy; a Gandharva is a musical spirit in Hindu mythology.

Supporting paragraphs: Madhup Mudgal Kumar Gandharva
Answer: Kumar Gandharva