Raga (singular rag or raga, plural raga or ragas) is a complex structure of musical melody used in India and should not be confused with scales. The main part of the Guru Granth Sahib, the Sikh holy Book and the perpetual Guru of the Sikhs consists of 31 distinct section called Ragas. The holy Granth starts with the a non-raga section which begins with Japji as the first entry. This is followed by Rehras and ending with Kirtan Sohila. Every time of the day, morning, afternoon, evening and night, has its specific ragas. Also See Kirtan, Sikh Kirtan, Taal, Ragmala