I say I'll learn to play piano...

hosts/workstation/toggles.nix

@@ -3,6 +3,7 @@
   emacs.enable = true;
   apps = {
     art.enable = true;
+    piano.enable = true;
     dictionaries.enable = true;
     fonts.enable = true;
     gaming.enable = true;

modules/apps/music.nix

@@ -0,0 +1,18 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+{
+  options.my.apps.piano.enable = lib.mkEnableOption "enable";
+  config = lib.mkIf config.my.apps.piano.enable {
+    users.users.jawz.packages = builtins.attrValues {
+      inherit (pkgs)
+        neothesia
+        linthesia
+        timidity
+        ;
+    };
+  };
+}