Bhajan is one of many genres of music stemming from the religion, Hinduism. Hinduism is considered to be the oldest religion in the world, coming from the 2nd century. The primary belief is that all are viewed as divine and everything in the universe represents a type of God or deity.
In its entirety, it has grown up to over 1 billion followers, making it the third most popular religion. In particular, Bhajan origins derive from the Vedic era, the Samaveda Samitha sheets were meant to be sung, forcing people to vocalize the sheets of music, ultimately creating Bhajan music.