Kalyan thaat consists of an important group of evening ragas. Characterised by the teevra Madhyam, this thaat literally means good luck. Ragas of this thaat are considered to be a blessing-seeking and soothing. As a result, they are performed in the evening at the beginning of a concert. These ragas create a feeling of the unfolding of an evening.[citation needed]
The Hindustani Classical Thaats are defined in their relation with the Bilawal Thaat, which has all shuddha(pure) notes.