1) Hindustani music 
[North Indian classical music] ...[music] Vadi, in both Hindustani classical music and Carnatic music, is the dominant swara (musical note) of a given raga (musical scale). `Vadi is the most sonant or most important note of a Raga.` It does not refer to the most played note but it rather refers to a note of special significance. It is usually the swara which is repeated the...
Vadi is the note that holds the maximum importance in a raga.