The very heart of Indian music is the raag, the melodic form upon which the artist improvises his performance. A raag is a scientific, precise, subtle and aesthetic melodic form with its own ascending and descending movement consisting of either a full seven-note octave or a series of six or five notes.Every raag is characterized by its own particular ras or mood. The acknowledged order of these nine sentiments, or emotions, is as follows: romantic and erotic, humorous, pathetic, anger, heroic, fearful, disgust, amazement and peaceful. Each raag, in addition to being associated with a particular mood, is also closely connected to a particular time of day or a season of the year. Thus through the rich melodies and rhythm of Indian music, every human emotion, every subtle feeling in man and nature, can be musically expressed and experienced.