LFE: A Lisp Flavour on the Erlang VM

Why yet another lisp? Why do we need/want a new lisp for the Erlang VM? What is it that makes the existing ones, even Clojure, a bad fit? LFE (Lisp Flavoured Erlang) has been designed to run efficiently on the Erlang VM and at the same time be a 'real lisp' providing Lisp's good bits.