Raga is a piece of Indian music that is rhythmic and used spontaneously.
The use of repetition in the line "I sing a mad raga/I sing a mad raga/a glad raga...is being used as a sort of call to arms, a mantra, a chant for equality in our society. It is something that people could copy and easily remember.
The use of reception of the word is also a form of anaphora. Used before each new idea, it makes the idea itself stand out. raga of yellow/raga of mellow/raga of new/raga of old/raga of blue/raga of gold.
