diff --git a/mopidy/mpd/protocol/audio_output.py b/mopidy/mpd/protocol/audio_output.py
index 981cdd55..868edc49 100644
--- a/mopidy/mpd/protocol/audio_output.py
+++ b/mopidy/mpd/protocol/audio_output.py
@@ -33,6 +33,19 @@ def enableoutput(context, outputid):
         raise exceptions.MpdNoExistError('No such audio output')
 
 
+# TODO: implement and test
+#@protocol.commands.add('toggleoutput', outputid=protocol.UINT)
+def toggleoutput(context, outputid):
+    """
+    *musicpd.org, audio output section:*
+
+        ``toggleoutput {ID}``
+
+        Turns an output on or off, depending on the current state.
+    """
+    pass
+
+
 @protocol.commands.add('outputs')
 def outputs(context):
     """
diff --git a/mopidy/mpd/protocol/current_playlist.py b/mopidy/mpd/protocol/current_playlist.py
index 45858f86..c2e54490 100644
--- a/mopidy/mpd/protocol/current_playlist.py
+++ b/mopidy/mpd/protocol/current_playlist.py
@@ -357,3 +357,65 @@ def swapid(context, tlid1, tlid2):
     position1 = context.core.tracklist.index(tl_tracks1[0]).get()
     position2 = context.core.tracklist.index(tl_tracks2[0]).get()
     swap(context, position1, position2)
+
+
+# TODO: add at least reflection tests before adding NotImplemented version
+#@protocol.commands.add(
+#    'prio', priority=protocol.UINT, position=protocol.RANGE)
+def prio(context, priority, position):
+    """
+    *musicpd.org, current playlist section:*
+
+        ``prio {PRIORITY} {START:END...}``
+
+        Set the priority of the specified songs. A higher priority means that
+        it will be played first when "random" mode is enabled.
+
+        A priority is an integer between 0 and 255. The default priority of new
+        songs is 0.
+    """
+    pass
+
+
+# TODO: add at least reflection tests before adding NotImplemented version
+#@protocol.commands.add('prioid')
+def prioid(context, *args):
+    """
+    *musicpd.org, current playlist section:*
+
+        ``prioid {PRIORITY} {ID...}``
+
+        Same as prio, but address the songs with their id.
+    """
+    pass
+
+
+# TODO: add at least reflection tests before adding NotImplemented version
+#@protocol.commands.add('addtagid', tlid=protocol.UINT)
+def addtagid(context, tlid, tag, value):
+    """
+    *musicpd.org, current playlist section:*
+
+        ``addtagid {SONGID} {TAG} {VALUE}``
+
+        Adds a tag to the specified song. Editing song tags is only possible
+        for remote songs. This change is volatile: it may be overwritten by
+        tags received from the server, and the data is gone when the song gets
+        removed from the queue.
+    """
+    pass
+
+
+# TODO: add at least reflection tests before adding NotImplemented version
+#@protocol.commands.add('cleartagid', tlid=protocol.UINT)
+def cleartagid(context, tlid, tag):
+    """
+    *musicpd.org, current playlist section:*
+
+        ``cleartagid {SONGID} [TAG]``
+
+        Removes tags from the specified song. If TAG is not specified, then all
+        tag values will be removed. Editing song tags is only possible for
+        remote songs.
+    """
+    pass
diff --git a/mopidy/mpd/protocol/music_db.py b/mopidy/mpd/protocol/music_db.py
index 2d895d67..3da9c5aa 100644
--- a/mopidy/mpd/protocol/music_db.py
+++ b/mopidy/mpd/protocol/music_db.py
@@ -547,3 +547,27 @@ def update(context, uri=None):
         ``status`` response.
     """
     return {'updating_db': 0}  # TODO
+
+
+# TODO: add at least reflection tests before adding NotImplemented version
+#@protocol.commands.add('readcomments')
+def readcomments(context, uri):
+    """
+    *musicpd.org, music database section:*
+
+        ``readcomments [URI]``
+
+        Read "comments" (i.e. key-value pairs) from the file specified by
+        "URI". This "URI" can be a path relative to the music directory or a
+        URL in the form "file:///foo/bar.ogg".
+
+        This command may be used to list metadata of remote files (e.g. URI
+        beginning with "http://" or "smb://").
+
+        The response consists of lines in the form "KEY: VALUE". Comments with
+        suspicious characters (e.g. newlines) are ignored silently.
+
+        The meaning of these depends on the codec, and not all decoder plugins
+        support it. For example, on Ogg files, this lists the Vorbis comments.
+    """
+    pass
diff --git a/mopidy/mpd/protocol/playback.py b/mopidy/mpd/protocol/playback.py
index c550a33a..a3de1891 100644
--- a/mopidy/mpd/protocol/playback.py
+++ b/mopidy/mpd/protocol/playback.py
@@ -32,6 +32,38 @@ def crossfade(context, seconds):
     raise exceptions.MpdNotImplemented  # TODO
 
 
+# TODO: add at least reflection tests before adding NotImplemented version
+#@protocol.commands.add('mixrampdb')
+def mixrampdb(context, decibels):
+    """
+    *musicpd.org, playback section:*
+
+        ``mixrampdb {deciBels}``
+
+    Sets the threshold at which songs will be overlapped. Like crossfading but
+    doesn't fade the track volume, just overlaps. The songs need to have
+    MixRamp tags added by an external tool. 0dB is the normalized maximum
+    volume so use negative values, I prefer -17dB. In the absence of mixramp
+    tags crossfading will be used. See http://sourceforge.net/projects/mixramp
+    """
+    pass
+
+
+# TODO: add at least reflection tests before adding NotImplemented version
+#@protocol.commands.add('mixrampdelay', seconds=protocol.UINT)
+def mixrampdelay(context, seconds):
+    """
+    *musicpd.org, playback section:*
+
+        ``mixrampdelay {SECONDS}``
+
+        Additional time subtracted from the overlap calculated by mixrampdb. A
+        value of "nan" disables MixRamp overlapping and falls back to
+        crossfading.
+    """
+    pass
+
+
 @protocol.commands.add('next')
 def next_(context):
     """