So which programming language is the most useful to learn?

This episode considers that question from all possible angles, starting with "I want to build a specific kind of application" to "Which languages is best as the first language for someone just starting to program?".

Spoiler: It's not about the features of the language (and not even about your favorite style of syntax). 

Extra Spoiler: The results are: Javascript, Java, Python, Erlang - listen to the episode to find out why and for what purpose