: Associating modulations with emotions I once read a book (pdf) from imslp or forgottenbooks that was about composition (or harmony), and it had a list of every possible modulation and its emotional association. For example,

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I'd look up under the doctrine of the affections in music.
en.wikipedia.org/wiki/Doctrine_of_the_affections
Below you have the literature and bibliography of this theme.

The book you are looking for could be the one cited of Mattheson or Mersenne.

Mattheson: Capellmeister

In der Capellmeister by Mattheson look for “Affecten” and “Modulation”.

Also search for L.c. Mizler (quoted by Mattheson) and Fux (Gradus ad Parnassum)

Edit:

As you say the Book was in English you might google searching for music, affects, keys, modulation and you’ll find articles or books (secondary literature) mentioning the original book you are looking for. Maybe if you read the title or the name of the author you will recognize it.

E.g. like this:
digitalcommons.cedarville.edu/cgi/viewcontent.cgi?article=1384&context=research_scholarship_symposium
Edit 2.

Have you seen this link:

How did baroque composers relate to human emotions?

the book you're looking for may be an English translation of Mattheson's Capellmeister:
www.jstor.org/stable/41639822?seq=1
Mattheson (English)