diff --git a/morituri/common/program.py b/morituri/common/program.py
index 60022b1..3a48987 100644
--- a/morituri/common/program.py
+++ b/morituri/common/program.py
@@ -42,6 +42,9 @@ class TrackMetadata(object):
     artist = None
     title = None
     duration = None # in ms
+    mbid = None
+    sortName = None
+    mbidArtist = None
 
 class DiscMetadata(object):
     """