{
  config,
  inputs,
  lib,
  pkgs,
  ...
}:
{
  options.my.apps.piano.enable = lib.mkEnableOption "piano learning and music theory apps";
  config = lib.mkIf config.my.apps.piano.enable {
    users.users =
      let
        packages = builtins.attrValues {
          inherit (pkgs)
            neothesia
            linthesia
            timidity
            ;
        };
      in
      inputs.self.lib.mkUserPackages lib config.my.toggleUsers.apps packages;
  };
}