diff --git a/mopidy/mpd/protocol/music_db.py b/mopidy/mpd/protocol/music_db.py
index b31d295b..302d37eb 100644
--- a/mopidy/mpd/protocol/music_db.py
+++ b/mopidy/mpd/protocol/music_db.py
@@ -6,7 +6,8 @@ import re
 
 from mopidy.models import Ref, Track
 from mopidy.mpd import translator
-from mopidy.mpd.exceptions import MpdArgError, MpdNotImplemented
+from mopidy.mpd.exceptions import (
+    MpdArgError, MpdNoExistError, MpdNotImplemented)
 from mopidy.mpd.protocol import handle_request, stored_playlists
 
 
@@ -417,7 +418,25 @@ def listall(context, uri=None):
 
         Lists all songs and directories in ``URI``.
     """
-    raise MpdNotImplemented  # TODO
+    if uri is None:
+        uri = '/'
+    if not uri.startswith('/'):
+        uri = '/%s' % uri
+
+    result = []
+    browse_futures = [context.core.library.browse(uri)]
+    while browse_futures:
+        for ref in browse_futures.pop().get():
+            if ref.type == Ref.DIRECTORY:
+                result.append(('directory', ref.uri))
+                browse_futures.append(context.core.library.browse(ref.uri))
+            elif ref.type == Ref.TRACK:
+                result.append(('file', ref.uri))
+
+    if not result:
+        raise MpdNoExistError('Not found', command='listall')
+
+    return [('directory', uri)] + result
 
 
 @handle_request(r'listallinfo$')
diff --git a/tests/mpd/protocol/test_music_db.py b/tests/mpd/protocol/test_music_db.py
index 163ccf88..78a94a78 100644
--- a/tests/mpd/protocol/test_music_db.py
+++ b/tests/mpd/protocol/test_music_db.py
@@ -123,12 +123,41 @@ class MusicDatabaseHandlerTest(protocol.BaseTestCase):
         self.assertInResponse('OK')
 
     def test_listall_without_uri(self):
+        tracks = [Track(uri='dummy:/a', name='a'),
+                  Track(uri='dummy:/b', name='b')]
+        self.backend.library.dummy_library = tracks
+        self.backend.library.dummy_browse_result = {
+            '/': [Ref.track(uri='dummy:/a', name='a'),
+                  Ref.directory(uri='/foo')],
+            '/foo': [Ref.track(uri='dummy:/b', name='b')]}
+
         self.sendRequest('listall')
-        self.assertEqualResponse('ACK [0@0] {} Not implemented')
+
+        self.assertInResponse('file: dummy:/a')
+        self.assertInResponse('directory: /dummy/foo')
+        self.assertInResponse('file: dummy:/b')
+        self.assertInResponse('OK')
 
     def test_listall_with_uri(self):
-        self.sendRequest('listall "file:///dev/urandom"')
-        self.assertEqualResponse('ACK [0@0] {} Not implemented')
+        tracks = [Track(uri='dummy:/a', name='a'),
+                  Track(uri='dummy:/b', name='b')]
+        self.backend.library.dummy_library = tracks
+        self.backend.library.dummy_browse_result = {
+            '/': [Ref.track(uri='dummy:/a', name='a'),
+                  Ref.directory(uri='/foo')],
+            '/foo': [Ref.track(uri='dummy:/b', name='b')]}
+
+        self.sendRequest('listall "/dummy/foo"')
+
+        self.assertNotInResponse('file: dummy:/a')
+        self.assertInResponse('directory: /dummy/foo')
+        self.assertInResponse('file: dummy:/b')
+        self.assertInResponse('OK')
+
+    def test_listall_with_unknown_uri(self):
+        self.sendRequest('listall "/unknown"')
+
+        self.assertEqualResponse('ACK [50@0] {listall} Not found')
 
     def test_listallinfo_without_uri(self):
         self.sendRequest('listallinfo')