Hassan was born on July 18, 1927, in Rajasthan, India, to a family of musicians. To keep up the family tradition, he began training under his father Ustad Azeem Khan and uncle Ustad Ismail Khan with a focus on Thumari. After Partition, Hassan and his family migrated to Chichawatni in Pakistan. The then aspiring singer made his debut in 1957 on Radio Pakistan.
Hassan’s love for ghazal was unmatched. His rendition of Faiz Ahmed Faiz’s Gulon Mein Rung Bharay is celebrated even today. Other than that, he sang hundreds of songs. Most popular among these include Pyar Bharay Dau Sharmile Nain, Koi Pyaar Se Bulaye Ga and Aik Husn Ki Devi Se Mujhe Pyaar Hua۔