diff --git a/picard/__init__.py b/picard/__init__.py
index 75d612886..e34266128 100644
--- a/picard/__init__.py
+++ b/picard/__init__.py
@@ -91,4 +91,5 @@ api_versions = [
     "1.1.0",
     "1.2.0",
     "1.3.0",
+    "1.4.0",
 ]
diff --git a/picard/formats/asf.py b/picard/formats/asf.py
index 7125cbcf2..e452ecc61 100644
--- a/picard/formats/asf.py
+++ b/picard/formats/asf.py
@@ -97,6 +97,7 @@ class ASFFile(File):
         'comment:': 'Description',
         'genre': 'WM/Genre',
         'bpm': 'WM/BeatsPerMinute',
+        'key': 'WM/InitialKey',
         'script': 'WM/Script',
         'language': 'WM/Language',
         'mood': 'WM/Mood',
diff --git a/picard/formats/id3.py b/picard/formats/id3.py
index 5fdb72386..9aaa4eaac 100644
--- a/picard/formats/id3.py
+++ b/picard/formats/id3.py
@@ -129,6 +129,7 @@ class ID3File(File):
         'TCOM': 'composer',
         'TENC': 'encodedby',
         'TBPM': 'bpm',
+        'TKEY': 'key',
         'TLAN': 'language',
         'TCON': 'genre',
         'TMED': 'media',
@@ -438,7 +439,7 @@ class ID3File(File):
             v1 = 2
         else:
             v1 = 0
-        
+
         if config.setting['write_id3v23']:
             tags.update_to_v23(join_with=config.setting['id3v23_join_with'])
             tags.save(filename, v2_version=3, v1=v1)
diff --git a/picard/formats/mp4.py b/picard/formats/mp4.py
index 67b5171d6..7fe09c9bb 100644
--- a/picard/formats/mp4.py
+++ b/picard/formats/mp4.py
@@ -102,6 +102,7 @@ class MP4File(File):
         "----:com.apple.iTunes:LANGUAGE": "language",
         "----:com.apple.iTunes:ARTISTS": "artists",
         "----:com.apple.iTunes:WORK": "work",
+        "----:com.apple.iTunes:initialkey": "key",
     }
     __r_freeform_tags = dict([(v, k) for k, v in __freeform_tags.iteritems()])
 
diff --git a/picard/util/tags.py b/picard/util/tags.py
index acc4ac78a..996ccfbef 100644
--- a/picard/util/tags.py
+++ b/picard/util/tags.py
@@ -39,6 +39,7 @@ TAG_NAMES = {
     'isrc': N_('ISRC'),
     'mood': N_('Mood'),
     'bpm': N_('BPM'),
+    'key': N_('Key'),
     'copyright': N_('Copyright'),
     'license': N_('License'),
     'composer': N_('Composer'),
diff --git a/test/test_formats.py b/test/test_formats.py
index f72db8256..2ff56b3e6 100644
--- a/test/test_formats.py
+++ b/test/test_formats.py
@@ -137,6 +137,7 @@ class FLACTest(FormatsTest):
         'comment:foo': 'Foo',
         'genre': 'Foo',
         'bpm': '80',
+        'key': 'E#m',
         'mood': 'Foo',
         'isrc': 'Foo',
         'copyright': 'Foo',
@@ -206,6 +207,7 @@ class WMATest(FormatsTest):
         #'comment:foo': 'Foo',
         'genre': 'Foo',
         'bpm': '80',
+        'key': 'E#m',
         'mood': 'Foo',
         'isrc': 'Foo',
         'copyright': 'Foo',
@@ -275,6 +277,7 @@ class MP3Test(FormatsTest):
         'comment:foo': 'Foo',
         'genre': 'Foo',
         'bpm': '80',
+        'key': 'E#m',
         'mood': 'Foo',
         'isrc': 'Foo',
         'copyright': 'Foo',
@@ -342,6 +345,7 @@ class TTATest(FormatsTest):
         'comment:foo': 'Foo',
         'genre': 'Foo',
         'bpm': '80',
+        'key': 'E#m',
         'mood': 'Foo',
         'isrc': 'Foo',
         'copyright': 'Foo',
@@ -410,6 +414,7 @@ if picard.formats.AiffFile:
             'comment:foo': 'Foo',
             'genre': 'Foo',
             'bpm': '80',
+            'key': 'E#m',
             'mood': 'Foo',
             'isrc': 'Foo',
             'copyright': 'Foo',
@@ -477,6 +482,7 @@ class OggVorbisTest(FormatsTest):
         'comment:foo': 'Foo',
         'genre': 'Foo',
         'bpm': '80',
+        'key': 'E#m',
         'mood': 'Foo',
         'isrc': 'Foo',
         'copyright': 'Foo',
@@ -545,6 +551,7 @@ class MP4Test(FormatsTest):
         #'comment:foo': 'Foo',
         'genre': 'Foo',
         'bpm': '80',
+        'key': 'E#m',
         'mood': 'Foo',
         'isrc': 'Foo',
         'copyright': 'Foo',
@@ -612,6 +619,7 @@ class WavPackTest(FormatsTest):
         'comment:foo': 'Foo',
         'genre': 'Foo',
         'bpm': '80',
+        'key': 'E#m',
         'mood': 'Foo',
         'isrc': 'Foo',
         'copyright': 'Foo',
@@ -679,6 +687,7 @@ class MusepackSV7Test(FormatsTest):
         'comment:foo': 'Foo',
         'genre': 'Foo',
         'bpm': '80',
+        'key': 'E#m',
         'mood': 'Foo',
         'isrc': 'Foo',
         'copyright': 'Foo',
@@ -746,6 +755,7 @@ class MusepackSV8Test(FormatsTest):
         'comment:foo': 'Foo',
         'genre': 'Foo',
         'bpm': '80',
+        'key': 'E#m',
         'mood': 'Foo',
         'isrc': 'Foo',
         'copyright': 'Foo',