I fully agree, and there are already great books for easily entering those world...

I fully agree, and there are already great books for easily entering those worlds:

Scheme:

The Little Schemer (a classic)

Common Lisp:

Land of Lisp (a truly remarkable, quaint book: learn Common Lisp by programming classic games; full with really funny cartoons.)

Practical Common Lisp (really excellent way to learn quickly, modern. Freely available.)