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There is another book which isn't often mentioned, which I like to consider "SICP-lite", Concrete Abstractions: https://gustavus.edu/mcs/max/concrete-abstractions.html

i havent read this book but i skimmed the toc and i have to say its probably even harder than sicp. http://www.info.ucl.ac.be/people/PVR/booktoc.pdf

Years ago, the author taught a MOOC covering parts of the book[0]. The course is archived on edX, and the videos are on YouTube[1]. It was fun starting from a super simple functional language and building to a dataflow functional language by the end.

[0] https://www.edx.org/course/paradigms-of-computer-programming...

[1] https://www.youtube.com/playlist?list=PLw454N-VXALSIzIe_eL5U...

This is a great book and uses a back then obscure, today defunct programming language Oz.

https://en.m.wikipedia.org/wiki/Oz_(programming_language)

an updated version that uses a current language would be nice, but the book isnt even open source (i.e. under the Creative Commons license)

Would it be easy to follow the book using Mercury language?