In Hindustani classical music, vivadi (Sanskrit: विवादि meaning "dissonant") refers to pitches that are not part of the arohana or avrohana of a given raga.
Although vivadi pitches are generally to be avoided during the playing of a given raga, they are occasionally added by skilled performers in order to introduce some color to an interpretation.
Vivadi term means going against the grain of thought or approach.
There are twelve swarams in Indian classical music.
Examples of popular Vivadi ragas are : Nata, Varali, Vagadheeswari.