diff --git a/musicutil/__main__.py b/musicutil/__main__.py
index 865f71b..6638d7f 100644
--- a/musicutil/__main__.py
+++ b/musicutil/__main__.py
@@ -7,23 +7,26 @@ from .commands.process_command import ProcessCommand, add_process_command, get_p
 from .commands.copy_command import CopyCommand, add_copy_command, get_copy_args
 from .commands.transcode_command import TranscodeCommand, add_transcode_command, get_transcode_args
 
+def main():
+    parser = argparse.ArgumentParser(
+        description="chaos's musicutil")
+    subparsers = parser.add_subparsers(dest="subparser_name")
 
-parser = argparse.ArgumentParser(
-    description="chaos's musicutil")
-subparsers = parser.add_subparsers(dest="subparser_name")
+    add_copy_command(subparsers)
+    add_process_command(subparsers)
+    add_transcode_command(subparsers)
+    add_genhtml_command(subparsers)
 
-add_copy_command(subparsers)
-add_process_command(subparsers)
-add_transcode_command(subparsers)
-add_genhtml_command(subparsers)
+    args = parser.parse_args()
 
-args = parser.parse_args()
+    if args.subparser_name == "process":
+        ProcessCommand(get_process_args(args)).run()
+    elif args.subparser_name == "copy":
+        CopyCommand(get_copy_args(args)).run()
+    elif args.subparser_name == "transcode":
+        TranscodeCommand(get_transcode_args(args)).run()
+    elif args.subparser_name == "genhtml":
+        GenHTMLCommand(get_genhtml_args(args)).run()
 
-if args.subparser_name == "process":
-    ProcessCommand(get_process_args(args)).run()
-elif args.subparser_name == "copy":
-    CopyCommand(get_copy_args(args)).run()
-elif args.subparser_name == "transcode":
-    TranscodeCommand(get_transcode_args(args)).run()
-elif args.subparser_name == "genhtml":
-    GenHTMLCommand(get_genhtml_args(args)).run()
+if __name__ == "__main__":
+    main()
\ No newline at end of file