What is "kajjanbai"

Kajjanbai was a singer and actress in India during the 1920s and 1930s, often referred to as the "Nightingale of Bengal". Aside from acting, she and Ghulam Mohammed also taught Noor Jehan when the latter was young, making her do riyaz up to 12 hours each day. Kajjan stopped singing in 1930, however, she continued to star in movies such as Shirin Farhad and Layla Majnun opposite Nissar, becoming a symbol of on-screen romance in the cinema of India.