This document provides definitions and descriptions of key terms related to Indian music nomenclature. It discusses the following: 1. Sangeet is defined as the threefold art of vocal, instrumental, and dance music. There are two main streams of Indian music - Hindustani and Carnatic. 2. Naad refers to the essence of music and vibrations/sounds, including ahat naad produced by objects hitting and anahat naad which is the cosmic sound. 3. Raags have specific rules regarding notes used while thaats are scales without salient features. Raags can be sung but thaats cannot. 4. Maseetkhani and Razakhan