Emacs Live is a setup to help you run Overtone, “an open source audio environment designed to explore new musical ideas from synthesis and sampling to instrument building, live-coding and collaborative jamming” based on Clojure and using SuperCollider. It’s an “opinionated set of defaults”. Essentially, the installation instructions recommend you move your init file (~/.emacs) and and Emacs user directory (~/.emacs.d/) away and start over with the user directory provided by Emacs Live.