diff --git a/songbook_core/content/sorted.TODO b/songbook_core/content/sorted.TODO
new file mode 100644
index 00000000..2fd4679f
--- /dev/null
+++ b/songbook_core/content/sorted.TODO
@@ -0,0 +1,23 @@
+    def __cmp__(self, other):
+        if not isinstance(other, Song):
+            return NotImplemented
+        for key in self.sort:
+            if key == "@title":
+                self_key = self.normalized_titles
+                other_key = other.normalized_titles
+            elif key == "@path":
+                self_key = locale.strxfrm(self.path)
+                other_key = locale.strxfrm(other.path)
+            elif key == "by":
+                self_key = self.normalized_authors
+                other_key = other.normalized_authors
+            else:
+                self_key = locale.strxfrm(self.args.get(key, ""))
+                other_key = locale.strxfrm(other.args.get(key, ""))
+
+            if self_key < other_key:
+                return -1
+            elif self_key > other_key:
+                return 1
+        return 0
+
diff --git a/songbook_core/songs.py b/songbook_core/songs.py
index 27e59194..e2222b85 100644
--- a/songbook_core/songs.py
+++ b/songbook_core/songs.py
@@ -14,8 +14,6 @@ from songbook_core.plastex import parsetex
 class Song(object):
     """Song management"""
 
-    #: Ordre de tri
-    sort = []
     #: Dictionnaire des options pour le traitement des auteurs
     authwords = {"after": [], "ignore": [], "sep": []}
 
@@ -48,30 +46,6 @@ class Song(object):
     def __repr__(self):
         return repr((self.titles, self.args, self.path))
 
-    def __cmp__(self, other):
-        if not isinstance(other, Song):
-            return NotImplemented
-        for key in self.sort:
-            if key == "@title":
-                self_key = self.normalized_titles
-                other_key = other.normalized_titles
-            elif key == "@path":
-                self_key = locale.strxfrm(self.path)
-                other_key = locale.strxfrm(other.path)
-            elif key == "by":
-                self_key = self.normalized_authors
-                other_key = other.normalized_authors
-            else:
-                self_key = locale.strxfrm(self.args.get(key, ""))
-                other_key = locale.strxfrm(other.args.get(key, ""))
-
-            if self_key < other_key:
-                return -1
-            elif self_key > other_key:
-                return 1
-        return 0
-
-
 def unprefixed_title(title, prefixes):
     """Remove the first prefix of the list in the beginning of title (if any).
     """