I agree about Clojure, not so much about Scala. Clojure built on solid proven foundations of LISP and JVM. While Scala is also built on JVM, it's semantics are

I agree about Clojure, not so much about Scala. Clojure built on solid proven foundations of LISP and JVM. While Scala is also built on JVM, it's semantics are completely new and unproven. And b/c Scala's semantics are complex (unlike LISP), it will be very hard to prove and make it mature. My other choice is Erlang/OTP, which is 20+ y/o dinosaur, controlled by Ericsson, not a modern language, but very stable and mature.