Running nixpkgs-update (https://nix-community.org/update-bot/) with UPDATE_INFO: deadbeefPlugins.musical-spectrum unstable-2020-07-01 -> 0.0.2015.10.13 https://repology.org/project/deadbeef:musical-spectrum/versions
attrpath: deadbeefPlugins.musical-spectrum
Checking auto update branch...
No auto update branch exists
[version] 
[version] updated version and sha256
[rustCrateVersion] 
[rustCrateVersion] No cargoHash found
[golangModuleVersion] 
[golangModuleVersion] Not a buildGoModule package with vendorHash
[npmDepsVersion] 
[npmDepsVersion] No npmDepsHash
[updateScript] 
[updateScript] skipping because derivation has no updateScript
Diff after rewrites:
diff --git a/pkgs/applications/audio/deadbeef/plugins/musical-spectrum.nix b/pkgs/applications/audio/deadbeef/plugins/musical-spectrum.nix
index a5d89de1e3c7..9909426a1e1e 100644
--- a/pkgs/applications/audio/deadbeef/plugins/musical-spectrum.nix
+++ b/pkgs/applications/audio/deadbeef/plugins/musical-spectrum.nix
@@ -11,13 +11,13 @@
 
 stdenv.mkDerivation {
   pname = "deadbeef-musical-spectrum-plugin";
-  version = "unstable-2020-07-01";
+  version = "0.0.2015.10.13";
 
   src = fetchFromGitHub {
     owner = "cboxdoerfer";
     repo = "ddb_musical_spectrum";
     rev = "a97fd4e1168509911ab43ba32d815b5489000a06";
-    sha256 = "0p33wyqi27y0q1mvjv5nn6l3vvqlg6b8yd6k2l07bax670bl0q3g";
+    sha256 = "sha256-b2BAFzimq3UAFdM0j5Z5FO89qLG2bLlrwMAfEbHnY1w=";
   };
 
   nativeBuildInputs = [ pkg-config ];

Source url did not change.