Raga plays an important role in Indian classical music. Raga is made up from the swara or note. According to characteristics of raga, Indian classical music is further divided into two systems Hindustani / North Indian classical music, Carnatic / South India classical music. This paper introduces us with some basic terms in Indian classical music and terms associated with raga. Then we discussed different techniques for raga identification along with their system structure. Different challenges associated with raga identification. © 2014 IEEE.