diff --git a/Makefile.am b/Makefile.am
index 70be090b9..d34b81f01 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -934,6 +934,7 @@ libtag_a_SOURCES =\
 	src/tag/ReplayGain.cxx src/tag/ReplayGain.hxx \
 	src/tag/MixRamp.cxx src/tag/MixRamp.hxx \
 	src/tag/Generic.cxx src/tag/Generic.hxx \
+	src/tag/Id3MusicBrainz.cxx src/tag/Id3MusicBrainz.hxx \
 	src/tag/ApeLoader.cxx src/tag/ApeLoader.hxx \
 	src/tag/ApeReplayGain.cxx src/tag/ApeReplayGain.hxx \
 	src/tag/ApeTag.cxx src/tag/ApeTag.hxx
diff --git a/NEWS b/NEWS
index 9dcc2e15b..5e8b6febd 100644
--- a/NEWS
+++ b/NEWS
@@ -10,6 +10,10 @@ ver 0.21 (not yet released)
   - alsa: non-blocking mode
 
 ver 0.20.10 (not yet released)
+* decoder
+  - ffmpeg: support MusicBrainz ID3v2 tags
+* tags
+  - aiff: fix FORM chunk size endianess (is big-endian)
 
 ver 0.20.9 (2017/06/04)
 * decoder
diff --git a/android/build.py b/android/build.py
index a37432e13..3ec3d9ba3 100755
--- a/android/build.py
+++ b/android/build.py
@@ -154,5 +154,9 @@ configure = [
 
 ] + configure_args
 
+from build.cmdline import concatenate_cmdline_variables
+configure = concatenate_cmdline_variables(configure,
+    set(('CFLAGS', 'CXXFLAGS', 'CPPFLAGS', 'LDFLAGS', 'LIBS')))
+
 subprocess.check_call(configure, env=toolchain.env)
 subprocess.check_call(['/usr/bin/make', '--quiet', '-j12'], env=toolchain.env)
diff --git a/doc/protocol.xml b/doc/protocol.xml
index 6819a2abc..692edaded 100644
--- a/doc/protocol.xml
+++ b/doc/protocol.xml
@@ -402,6 +402,15 @@
                 </para>
               </listitem>
             </itemizedlist>
+
+            <para>
+              Change events accumulate, even while the connection is
+              not in "idle" mode; no events gets lost while the client
+              is doing something else with the connection.  If an
+              event had already occurred since the last call, the new
+              <command>idle</command> command will return immediately.
+            </para>
+
             <para>
               While a client is waiting for <command>idle</command>
               results, the server disables timeouts, allowing a client
diff --git a/python/build/cmdline.py b/python/build/cmdline.py
new file mode 100644
index 000000000..50245f597
--- /dev/null
+++ b/python/build/cmdline.py
@@ -0,0 +1,29 @@
+def concatenate_cmdline_variables(src, names):
+    """Find duplicate variable declarations on the given source list, and
+    concatenate the values of those in the 'names' list."""
+
+    # the result list being constructed
+    dest = []
+
+    # a map of variable name to destination list index
+    positions = {}
+
+    for item in src:
+        i = item.find('=')
+        if i > 0:
+            # it's a variable
+            name = item[:i]
+            if name in names:
+                # it's a known variable
+                if name in positions:
+                    # already specified: concatenate instead of
+                    # appending it
+                    dest[positions[name]] += ' ' + item[i + 1:]
+                    continue
+                else:
+                    # not yet seen: append it and remember the list
+                    # index
+                    positions[name] = len(dest)
+        dest.append(item)
+
+    return dest
diff --git a/python/build/libs.py b/python/build/libs.py
index bdcfeb3d3..1bc22639e 100644
--- a/python/build/libs.py
+++ b/python/build/libs.py
@@ -57,6 +57,17 @@ libmad = AutotoolsProject(
     autogen=True,
 )
 
+liblame = AutotoolsProject(
+    'http://downloads.sourceforge.net/project/lame/lame/3.99/lame-3.99.5.tar.gz',
+    '24346b4158e4af3bd9f2e194bb23eb473c75fb7377011523353196b19b9a23ff',
+    'lib/libmp3lame.a',
+    [
+        '--disable-shared', '--enable-static',
+        '--disable-gtktest', '--disable-analyzer-hooks',
+        '--disable-decoder', '--disable-frontend',
+    ],
+)
+
 ffmpeg = FfmpegProject(
     'http://ffmpeg.org/releases/ffmpeg-3.3.2.tar.xz',
     '1998de1ab32616cbf2ff86efc3f1f26e76805ec5dc51e24c041c79edd8262785',
diff --git a/src/decoder/plugins/FfmpegMetaData.cxx b/src/decoder/plugins/FfmpegMetaData.cxx
index 74052160e..07be3cad3 100644
--- a/src/decoder/plugins/FfmpegMetaData.cxx
+++ b/src/decoder/plugins/FfmpegMetaData.cxx
@@ -24,6 +24,7 @@
 #include "FfmpegMetaData.hxx"
 #include "tag/Table.hxx"
 #include "tag/Handler.hxx"
+#include "tag/Id3MusicBrainz.hxx"
 
 extern "C" {
 #include <libavutil/dict.h>
@@ -75,6 +76,11 @@ FfmpegScanDictionary(AVDictionary *dict,
 		     i->name != nullptr; ++i)
 			FfmpegScanTag(i->type, dict, i->name,
 				      handler, handler_ctx);
+
+		for (const struct tag_table *i = musicbrainz_txxx_tags;
+		     i->name != nullptr; ++i)
+			FfmpegScanTag(i->type, dict, i->name,
+				      handler, handler_ctx);
 	}
 
 	if (handler.pair != nullptr)
diff --git a/src/tag/Aiff.cxx b/src/tag/Aiff.cxx
index faa47f6b2..b6a7aa7ed 100644
--- a/src/tag/Aiff.cxx
+++ b/src/tag/Aiff.cxx
@@ -49,7 +49,7 @@ aiff_seek_id3(InputStream &is)
 	aiff_header header;
 	is.ReadFull(&header, sizeof(header));
 	if (memcmp(header.id, "FORM", 4) != 0 ||
-	    (is.KnownSize() && FromLE32(header.size) > is.GetSize()) ||
+	    (is.KnownSize() && FromBE32(header.size) > is.GetSize()) ||
 	    (memcmp(header.format, "AIFF", 4) != 0 &&
 	     memcmp(header.format, "AIFC", 4) != 0))
 		throw std::runtime_error("Not an AIFF file");
diff --git a/src/tag/Id3MusicBrainz.cxx b/src/tag/Id3MusicBrainz.cxx
new file mode 100644
index 000000000..b1f747cf2
--- /dev/null
+++ b/src/tag/Id3MusicBrainz.cxx
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2003-2017 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "Id3MusicBrainz.hxx"
+#include "Table.hxx"
+#include "Type.h"
+
+const struct tag_table musicbrainz_txxx_tags[] = {
+	{ "ALBUMARTISTSORT", TAG_ALBUM_ARTIST_SORT },
+	{ "MusicBrainz Artist Id", TAG_MUSICBRAINZ_ARTISTID },
+	{ "MusicBrainz Album Id", TAG_MUSICBRAINZ_ALBUMID },
+	{ "MusicBrainz Album Artist Id",
+	  TAG_MUSICBRAINZ_ALBUMARTISTID },
+	{ "MusicBrainz Track Id", TAG_MUSICBRAINZ_TRACKID },
+	{ "MusicBrainz Release Track Id",
+	  TAG_MUSICBRAINZ_RELEASETRACKID },
+	{ nullptr, TAG_NUM_OF_ITEM_TYPES }
+};
diff --git a/src/tag/Id3MusicBrainz.hxx b/src/tag/Id3MusicBrainz.hxx
new file mode 100644
index 000000000..bbdfc4b26
--- /dev/null
+++ b/src/tag/Id3MusicBrainz.hxx
@@ -0,0 +1,25 @@
+/*
+ * Copyright 2003-2017 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_TAG_ID3MUSICBRAINZ_HXX
+#define MPD_TAG_ID3MUSICBRAINZ_HXX
+
+extern const struct tag_table musicbrainz_txxx_tags[];
+
+#endif
diff --git a/src/tag/Id3Scan.cxx b/src/tag/Id3Scan.cxx
index 670eadaf6..d36762845 100644
--- a/src/tag/Id3Scan.cxx
+++ b/src/tag/Id3Scan.cxx
@@ -23,6 +23,7 @@
 #include "Handler.hxx"
 #include "Table.hxx"
 #include "Builder.hxx"
+#include "Id3MusicBrainz.hxx"
 #include "util/Alloc.hxx"
 #include "util/ScopeExit.hxx"
 #include "util/StringStrip.hxx"
@@ -209,19 +210,8 @@ gcc_pure
 static TagType
 tag_id3_parse_txxx_name(const char *name) noexcept
 {
-	static constexpr struct tag_table txxx_tags[] = {
-		{ "ALBUMARTISTSORT", TAG_ALBUM_ARTIST_SORT },
-		{ "MusicBrainz Artist Id", TAG_MUSICBRAINZ_ARTISTID },
-		{ "MusicBrainz Album Id", TAG_MUSICBRAINZ_ALBUMID },
-		{ "MusicBrainz Album Artist Id",
-		  TAG_MUSICBRAINZ_ALBUMARTISTID },
-		{ "MusicBrainz Track Id", TAG_MUSICBRAINZ_TRACKID },
-		{ "MusicBrainz Release Track Id",
-		  TAG_MUSICBRAINZ_RELEASETRACKID },
-		{ nullptr, TAG_NUM_OF_ITEM_TYPES }
-	};
 
-	return tag_table_lookup(txxx_tags, name);
+	return tag_table_lookup(musicbrainz_txxx_tags, name);
 }
 
 /**
diff --git a/win32/build.py b/win32/build.py
index 1a08ba97f..c6dd7005e 100755
--- a/win32/build.py
+++ b/win32/build.py
@@ -76,6 +76,7 @@ thirdparty_libs = [
     flac,
     zlib,
     libid3tag,
+    liblame,
     ffmpeg,
     curl,
     boost,
@@ -112,5 +113,9 @@ configure = [
 
 ] + configure_args
 
+from build.cmdline import concatenate_cmdline_variables
+configure = concatenate_cmdline_variables(configure,
+    set(('CFLAGS', 'CXXFLAGS', 'CPPFLAGS', 'LDFLAGS', 'LIBS')))
+
 subprocess.check_call(configure, env=toolchain.env)
 subprocess.check_call(['/usr/bin/make', '--quiet', '-j12'], env=toolchain.env)