diff --git a/beetsplug/discogs.py b/beetsplug/discogs.py
index 3b2595585..b1b1593cd 100644
--- a/beetsplug/discogs.py
+++ b/beetsplug/discogs.py
@@ -505,6 +505,12 @@ class DiscogsPlugin(BeetsPlugin):
                         for subtrack in subtracks:
                             if not subtrack.get('artists'):
                                 subtrack['artists'] = index_track['artists']
+                    # Concatenate index with track title when index_tracks
+                    # option is set
+                    if self.config['index_tracks']:
+                        for subtrack in subtracks:
+                            subtrack['title'] = '{}: {}'.format(
+                                    index_track['title'], subtrack['title'])
                     tracklist.extend(subtracks)
             else:
                 # Merge the subtracks, pick a title, and append the new track.
@@ -557,7 +563,8 @@ class DiscogsPlugin(BeetsPlugin):
         title = track['title']
         if self.config['index_tracks']:
             prefix = ', '.join(divisions)
-            title = ': '.join([prefix, title])
+            if prefix:
+                title = '{}: {}'.format(prefix, title)
         track_id = None
         medium, medium_index, _ = self.get_track_index(track['position'])
         artist, artist_id = MetadataSourcePlugin.get_artist(
diff --git a/beetsplug/mpdstats.py b/beetsplug/mpdstats.py
index 39b045f9b..599aa7631 100644
--- a/beetsplug/mpdstats.py
+++ b/beetsplug/mpdstats.py
@@ -18,6 +18,7 @@ from __future__ import division, absolute_import, print_function
 import mpd
 import socket
 import select
+import sys
 import time
 import os
 
@@ -52,7 +53,13 @@ class MPDClientWrapper(object):
         self.music_directory = (
             mpd_config['music_directory'].as_str())
 
-        self.client = mpd.MPDClient(use_unicode=True)
+        if sys.version_info < (3, 0):
+            # On Python 2, use_unicode will enable the utf-8 mode for
+            # python-mpd2
+            self.client = mpd.MPDClient(use_unicode=True)
+        else:
+            # On Python 3, python-mpd2 always uses Unicode
+            self.client = mpd.MPDClient()
 
     def connect(self):
         """Connect to the MPD.
diff --git a/docs/changelog.rst b/docs/changelog.rst
index fbe449ca4..0fb503f80 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -176,6 +176,9 @@ New features:
 
 Fixes:
 
+* :bug:`/plugins/discogs`: Fixed a bug with ``index_tracks`` options that
+  sometimes caused the index to be discarded. Also remove the extra semicolon
+  that was added when there is no index track.
 * :doc:`/plugins/subsonicupdate`: REST was using `POST` method rather `GET` method.
   Also includes better exception handling, response parsing, and tests.
 * :doc:`/plugins/the`: Fixed incorrect regex for 'the' that matched any
@@ -290,6 +293,8 @@ Fixes:
   :bug:`2242`
 * :doc:`plugins/replaygain`: Disable parallel analysis on import by default.
   :bug:`3819`
+* :doc:`/plugins/mpdstats`: Fix Python 2/3 compatibility
+  :bug:`3798`
 * Fix :bug:`3308` by using browsing for big releases to retrieve additional
   information. Thanks to :user:`dosoe`.