In Sri Guru Granth Sahib Ji, Guru Ji told us to sing shabads in particular types of raags, because it will add to the feeling (emotional Effect) that the bani wants the soul to feel. There is 31 Raags used in Sri Guru Granth Sahib Ji. We hear raags very rarely in gurdwaras as it is a hard art for people to learn to perform raags. However just in the same way shaster vidiya is dying out within Sikhi so are raags. We need to revive both of them quick as possible as they are both a hukam from Guru ji.
Download Shabads Performed in these raags they are mind blowing: http://www.gurmatveechar.org/audio/keertan/keertan.php?q=f&f=/Pr
