diff --git a/iTunesParser.py b/iTunesParser.py
index b49430c..761508d 100644
--- a/iTunesParser.py
+++ b/iTunesParser.py
@@ -66,6 +66,8 @@ class ITunesParser:
     """
         Parse an iTunes Library and produce JSON - for ELS
     """
+    ELS_INDEX_NAME = "itunessongs"
+
     def __init__(self):
         self._tracks = {}
         self._albums = {}
@@ -231,21 +233,6 @@ class ITunesParser:
 
 
 class WriteElsJson:
-    def to_json(self):
-        """
-            Just do processSong()
-            or do process_songs, then _write_artists and _write_albums.
-            Note: process_songs do a process_artists and process_albums...
-            This method suck.
-        """
-        ret = self._process_songs()
-
-        self._write_artists()
-        self._write_albums()
-
-        # return json.dumps(jsonObj, indent=indent, cls=SetEncoder)
-        return ret
-
     @staticmethod
     def write_artists(artists, output_file):
         """
@@ -258,7 +245,7 @@ class WriteElsJson:
             artist['Rating'] = round(artist['Rating'])
 
             json_track_index = {
-                "index": {"_index": "itunessongs", "_type": "artist", "_id": persistent_id}
+                "index": {"_index": ITunesParser.ELS_INDEX_NAME, "_type": "artist", "_id": persistent_id}
             }
 
             file_artist.write(bytes(json.dumps(json_track_index, indent=None, cls=SetEncoder), 'UTF-8'))
@@ -279,7 +266,7 @@ class WriteElsJson:
             album['Rating'] = round(album['Rating'])
 
             json_track_index = {
-                "index": {"_index": "itunessongs", "_type": "album", "_id": persistent_id}
+                "index": {"_index": ITunesParser.ELS_INDEX_NAME, "_type": "album", "_id": persistent_id}
             }
 
             file_albums.write(bytes(json.dumps(json_track_index, indent=None, cls=SetEncoder), 'UTF-8'))
@@ -296,7 +283,7 @@ class WriteElsJson:
         file = io.open(output_file, 'wb')
         for persistent_id, song in songs.items():
             json_track_index = {
-                "index": {"_index": "itunessongs", "_type": "song", "_id": persistent_id}
+                "index": {"_index": ITunesParser.ELS_INDEX_NAME, "_type": "song", "_id": persistent_id}
             }
 
             file.write(bytes(json.dumps(json_track_index, indent=None, cls=SetEncoder), 'UTF-8'))
@@ -314,7 +301,9 @@ DEFAULT_LIBRARY_FILE = os.path.expanduser(DEFAULT_LIBRARY_FILE_NAME)
 DEFAULT_OUTPUT_FILE = os.path.dirname(os.path.realpath(__file__)) + DEFAULT_OUTPUT_FILE_NAME
 
 # Get options
-parser = argparse.ArgumentParser()
+parser = argparse.ArgumentParser(description="""
+    Parse an iTunes XML library file to produce JSON file for ELS bulk operation.
+    """)
 parser.add_argument('-f', '--file', default=DEFAULT_LIBRARY_FILE,
                     help='iTunes Library XML file path (default: ./' + DEFAULT_LIBRARY_FILE_NAME + ')')
 parser.add_argument('-o', '--output', default=DEFAULT_OUTPUT_FILE,