What is the Etawah gharana?

The Etawah gharana, also called the Imdadkhani gharana, is a school of sitar and surbahar playing that formed in the 19th century around Imdad Khan. It takes its name from Etawah, a town near Agra. Family accounts begin with his father, Sahabdad Khan. Imdad Khan based his style on khayal singing, which grew into the gayaki ang, a way of playing that follows the voice. Vilayat Khan and Shahid Parvez carried it on, and Shahid Parvez trained his son Shakir Khan.