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The target audience are people who don't want to learn Lisp but want to write a bunch of Lisp interpreters and compilers. Obviously.

There's a reason SICP isn't called Structure and Interpretation of Lisp Programs. Lisp is incidental.

Imagine a book where you wrote a bunch of Javascript implementations without learning Javascript.

There is a reason SICP uses Lisp.

There is. Scheme is a great pedagogical language. The book isn't _about_ Lisp though.

That's a pretty narrow view of the teachings to be gained from SICP.