These are Brahmin priests and musicians carrying on some kind of ceremony at Sri Meenakshi. They are using microphones and playing it over loudspeakers at a truly deafening volume. I literally put my fingers in my ears when walking past the loudspeakers because I was afraid of hearing damage. While I have no idea what it was about, it was fascinating.
See the full set of 50 photos of my 2007 India trip at