Rāga (Sanskrit, lit. "colour" or "moo"; or rāgam in Carnatic music) refers to melodic modes used in Indian classical music. It is a series of five or more musical notes upon which a melody is founded. In the Indian musical tradition, ragas are held in different times of the day. Indian classical music is always set in raga. Non-classical music such as popular Indian film songs sometimes use ragas in their compositions.