The culture of Varanasi is closely associated with the river Ganges and the river's religious importance. The city has been a cultural and religious centre in northern India for several thousand years. A particular style of classical Hindustani music developed in Varanasi centuries ago, and many prominent Indian philosophers, poets, writers, and musicians resided or reside in Varanasi, including Kabir, Ravi Das, Munshi Premchand, Jaishankar Prasad, Acharya Ram Chandra Shukla, Pandit Ravi Shankar, Hariprasad Chaurasia, and Ustad Bismillah Khan. Tulsidas wrote his Ramcharitmanas there, and Gautam Buddha gave his first sermon at Sarnath near Kashi. Ayurveda is said to have originated at Varanasi