Chilla katna
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In Hindustani classical music, chilla or chilla katna is a stage of training or ritual where the student is fully isolated from the outside world and lives for music only. Some musicians spend long periods of their training in varying degrees of isolation and describe these as their chilla; for others, it's a shorter, more extreme retreat, traditionally lasting 40 days. In either form, it is thought to have the power of transforming not only the student's music, but his whole life. Chilla is widely used in the Punjab gharānā (school) of tabla playing.
Abdul Karim Khan, a singer of the Kirana gharana, described chilla as "lighting a fire under your life. You either cook or you burn. If you cook, everyone can enjoy your flavour – otherwise, you'll be a mass of cinders, a heap of ash." (Guided Tour into a Fabulous World, The Music Magazine, 2001)