Trouble running Common Music in Emacs - bash

Question

I am a 4th year bachelor student composition who recently came across the GitHub repositories of Prof. Orm Finnendahl. I was wondering if anyone could help me setup Common Music 2.12.0 with Emacs on Windows 7, 64 bit. I’m embarrassed to say I have been trying on and off now for a couple of months and just can’t figure it out! I’ve read CM’s documentation, but it simply doesn’t seem to work.
I’ve tried following the instructions on the older website dedicated to CM2 (prior to CM3). Specifically these two links: "Installing Common Music", and "Running Common Music in Emacs". I did get the Emacs part right, I think, but Bash gives an error trying to load anything.
(I put the cm-master without the -master, and other repositories in C:/Users/XI-USER/lispmusic)
My Emacs is, I believe properly setup, as follows in the init file (the last lines are from the "Running Common Music in Emacs" website):
(require 'package)
(add-to-list 'package-archives '("melpa" . "https://melpa.org/packages/") t)
(package-initialize)
(load (expand-file-name "~/quicklisp/slime-helper.el"))
(setq inferior-lisp-program "sbcl")
(global-linum-mode t)
(add-hook 'prog-mode-hook 'highlight-numbers-mode)
(add-hook 'emacs-lisp-mode-hook 'highlight-quoted-mode)
(add-hook 'prog-mode-hook #'rainbow-delimiters-mode)
(add-hook 'emacs-lisp-mode-hook 'highlight-defined-mode)
(use-package kaolin-themes
:config
(load-theme 'kaolin-galaxy t))
;; If t, enable italic style in comments.
(setq kaolin-themes-italic-comments t)
;; When t, will display colored hl-line style instead monochrome.
(setq kaolin-themes-hl-line-colored t)
;; Enable distinct background for fringe and line numbers.
(setq kaolin-themes-distinct-fringe t)
;; Enable distinct colors for company popup scrollbar.
(setq kaolin-themes-distinct-company-scrollbar t)
;; Show git-gutter indicators as solid lines
(setq kaolin-themes-git-gutter-solid t)
(custom-set-variables
;; custom-set-variables was added by Custom.
;; If you edit it by hand, you could mess it up, so be careful.
;; Your init file should contain only one such instance.
;; If there is more than one, they won't work right.
'(package-selected-packages (quote (use-package)))
'(tool-bar-mode nil))
(custom-set-faces
;; custom-set-faces was added by Custom.
;; If you edit it by hand, you could mess it up, so be careful.
;; Your init file should contain only one such instance.
;; If there is more than one, they won't work right.
'(default ((t (:family "Victor Mono" :foundry "outline" :slant normal :weight bold :height 120 :width normal)))))
(add-to-list 'load-path "C:/Users/XI-USER/.slime/")
(add-to-list 'load-path "C:/Users/XI-USER/lispmusic/cm/")
(load "etc/emacs/cm.el")
(enable-cm-commands)
I have both Git Bash and cygwin64 installed (I believe Bash is 64 bit too, should it matter)
When I load cm/bin/cm.sh via Emacs shell, I get this error message in Bash:
debugger invoked on a SB-INT:SIMPLE-FILE-ERROR in thread
#<THREAD "main thread" RUNNING {10027900C3}>:
Couldn't load "/c/Users/XI-USER/lispmusic/cm/bin/../src/cm.lisp": file does
not exist.
Type HELP for debugger help, or (SB-EXT:EXIT) to exit from SBCL.
restarts (invokable by number or by possibly-abbreviated name):
0: [CONTINUE] Ignore runtime option --eval "(progn (load \"/c/Users/XI-USER/lispmusic/cm/bin/../src/cm.lisp\" :verbose nil) (cm))".
1: [ABORT ] Skip rest of --eval and --load options.
2: Skip to toplevel READ/EVAL/PRINT loop.
3: [EXIT ] Exit SBCL (calling #'EXIT, killing the process).
(LOAD "/c/Users/XI-USER/lispmusic/cm/bin/../src/cm.lisp" :VERBOSE NIL :PRINT NIL :IF-DOES-NOT-EXIST T :EXTERNAL-FORMAT :DEFAULT)
0]
And nothing via cygwin64 (black DOS screen starts up and closes immediately)
I get these type of errors trying to load CM in Emacs:
M-x cm -> "Wrong type argument: stringp, nil"
and CL-USER> (in-package :cm) -> "The name "CM" does not designate any package.
[Condition of type SB-KERNEL:SIMPLE-PACKAGE-ERROR]"
Interestingly, when (and only when) I start up slime, and then type C-c C-d c the CM find dictionary does work!