Question: Mashkoor Ali Khan was one of the primary living masters of a gharana who was concerned with perfect intonation of what?

Context paragraphs:
Johar Ali Khan: Johar Ali Khan is a Classical Indian violinist.  He is the son and disciple of the Late Ustad Gohar Ali Khan of Rampur, one of the greatest violin genius.  He belongs to the Patiala Gharana of Rampur.  He is the only living classical violinist from Patiala Gharana after his father - late Ustatd Gohar Ali Khan.  His grandfather was Ustad Ali Baksh, the founder of Patiala Gharana, who has produced a number of great musicians like Bade Fateh Ali Khan, Amanat Ali Khan, Asad Amanat Ali Khan, and Hamid Ali Khan.

Arshad Ali Khan: Arshad Ali Khan is an Indian classical singer and teacher of Kirana Gharana.  He descends from the family lineage of Ustad Abdul Wahid Khan and Ustad Abdul Karim Khan, who are deemed as the founders of Kirana Gharana.  He got education in music from his maternal uncles Ustad Mashkoor Ali Khan and Ustad Mubarak Ali Khan, the primary masters of Kirana Gharana musical style.

Rafaqat Ali Khan: Ustad Rafaqat Ali Khan is a Pakistani singer-songwriter and musician.  Trained as a classical singer, he is the son of legendary singer Nazakat Ali Khan and nephew of Salamat Ali Khan of Sham Chaurasia gharana.  He is the cousin of Ustad Shafqat Ali Khan. With the career spanning over two decades, Khan has established himself as a successful artist releasing a total of eleven albums.

Mashkoor Ali Khan: Ustad Mashkoor Ali Khan is an Indian classical singer, teacher, and one of the primary living masters of the Kirana gharana musical style.  As the grandson of Ustad Abdul Karim Khan he is a descendant of the gharana's family lineage.  He was educated by his father, the sarangi player Ustad Shakoor Khan, a major sarangi player of the 20th century and a student of Ustad Abdul Wahid Khan.

Kirana gharana: Kirana Gharana is one of the most prolific Hindustani khyal gharanas, and is concerned foremost with perfect intonation of notes (swara) or "sur".

ITC Sangeet Research Academy: ITC Sangeet Research Academy is a Hindustani classical music academy run by the corporate house, ITC Ltd..  It is located in Kolkata, India.  Noted musicians associated with the academy include Ulhas Kashalkar Ajoy Chakrabarty Mashkoor Ali Khan Girija Devi.  Satyajit Ray, was one of the trustees.

Sanhita Nandi: Sanhita Nandi is a prominent Hindustani classical vocalist of the Kirana Gharana.  The central motif of her style is slow tempo "raga" development (voice culture, voice throw, and tonal application) and ornamented "sargams". Sanhita Nandi has rightly established herself as a leading exponent of Khayal, earning high acclaim from discerning critics and enthusiastic audiences on an international scale.  Sanhita has developed a distinctive singing style based on firm grounding of traditional training (or taleem), combining pure lyricism with impeccable technique.To further enrich her repository of Kirana Lineage and traditional compositions, Sanhita continues to get trained under the able guidance of Ustad Mashkoor Ali Khan. The heart of her music is the slow, leisurely development of Raag Bhava in Merukhand style in Ati vilambit.  The vistar is richly embellished by meend, harkat, and sargams.  As the badhat gets slowly ornamented in the choicest pearls of melodic variations that build the sculpture of the raga, it slowly gets decorated into faster tempo where it befriends sargams, chota khayal, tarana and soft silky sapat taans . Extreme care is taken not to disrupt the Raag Bhava even in faster tempo . Even the phirat adds to the wet, warmth of feelings embedded in the raga.

Amjad Ali Khan (Indian vocalist): Amjad Ali Khan is an Indian classical singer and teacher of Kirana Gharana.  He descends from the family lineage of Ustad Abdul Wahid Khan and Ustad Abdul Karim Khan, who are deemed as the founders of Kirana Gharana.  He got education in music from his father Ustad Akhtar Nawaz Khan, and his maternal uncles Ustad Mashkoor Ali Khan and Ustad Mubarak Ali Khan, the primary masters of Kirana Gharana musical style.

Indore gharana: Indore gharana is one of the vocal gharanas of Indian classical music.  It was founded by Amir Khan, who studied the styles of Abdul Wahid Khan, Aman Ali Khan, Rajab Ali Khan and Abdul Karim Khan and amalgamated the essence of the styles of these four maestros with his own intellectual approach to music, and conceived the Indore gharana of music.

Sukhawat Ali Khan: Sukhawat Ali Khan, son of Indian-Pakistani vocalist Ustad Salamat Ali Khan and nephew of Nazakat Ali Khan, is a classical singer of Sham Chaurasia gharana tradition, as well as a performer of North Indian and Pakistani classical music and related folk music.  He began singing and playing the harmonium at age seven and has performed around the world.  He currently lives in the San Francisco Bay Area where he performs in the world-fusion ensemble Shabaz (formerly the Ali Khan Band) with his sister Riffat Salamat and her husband Richard Michos.

Supporting paragraphs: Mashkoor Ali Khan Kirana gharana
Answer: swara