Thaat is the parental
scale from which a Raaga
is derived. This concept was
introduced by Pt. Bhatkhande,
who clubbed all the
Raagas under 10 main
categories, called Thaat.
Thus, a Thaat can
have many Raagas
belonging to it. The term
Thaat refers to the
basic patterns in which the
seven notes of the Saptak
are arranged.
Every Thaat has one
Raaga that bears its
name. Other Raaga-s
are derived from the
Thaat by dropping one or
more Swara-s from the
parental scale.