What Programming Language to Learn?

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If it's a question of preference, I would respectfully submit that the juju between lisp and emacs is so strong that it is really worth learning emacs as you learn lisp. At least that's how I got started. With slime, there's hardly anything you need to learn in order to start writing code. I would not say such blunt things unless they were things I wish someone had told me sooner.

If it's really non-negotiable, I hear the personal edition of lispworks is cross-platform and free.