Ustad Amir Khan singing vilambit and drut khayal in Raga Chandrakauns. It is a concert recording of which the date and time are unknown, but Khansahib's singing style suggests it could be from the mid-1950s. The audio quality is not good but I have tried to improve it digitally as much as possible. With thanks to Bhuvanesh Bhatt for the original track.
Mr. Surendra Baxi, - a friend and disciple of Amir Khansahib who also shared this recording on YouTube - has confirmed that the concert was at Swami Haridas Sangeet Sammelan in Mumbai in 1954.