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Scheme is a programming language in the Lisp family, it is used internally by the higher level language LilyPond — for music engraving.

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How do I define an Lilypond/Scheme alist as cons of two a lists?

There are two issues with your code. As others noted, what you really want to do is append the alists. (Also, you forgot the leading # to escape from Lilypond to Scheme.) For comparision, this is …
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