On 2022-06-03, Joseph Turner wrote:
> * gnu/packages/emacs-xyz.scm (emacs-simple-mpc): Update to latest git commit.
...
>  (define-public emacs-simple-mpc
>    ;; There have been no releases.
> -  (let ((commit "bee8520e81292b4c7353e45b193f9a13b482f5b2")
> -        (revision "1"))
> +  (let ((commit "57ee14ada8aec477ddde5e4f632c8d3d99a66535")
> +        (revision "2"))
>      (package
>        (name "emacs-simple-mpc")
> -      (version (git-version "0" revision commit))
> +      (version (git-version "1" revision commit))

This was later updated to a newer commit version:

38c6af243132c20d72469b9b0dc607e65d455c64 gnu: emacs-simple-mpc: Update to 1.0-1.35923ca.

Marking as done.

live well,
  vagrant