diff --git a/songbook_core/content/__init__.py b/songbook_core/content/__init__.py
index 27c5967a..3b908868 100644
--- a/songbook_core/content/__init__.py
+++ b/songbook_core/content/__init__.py
@@ -3,6 +3,7 @@
 
 import glob
 import importlib
+import jinja2
 import logging
 import os
 
@@ -14,7 +15,7 @@ EOL = '\n'
 class Content:
     """Content item of type 'example'."""
 
-    def render(self):
+    def render(self, context):
         """Render this content item.
 
         Returns a string, to be placed verbatim in the generated .tex file.
@@ -23,12 +24,13 @@ class Content:
 
     # Block management
 
-    def begin_new_block(self, previous):
+    def begin_new_block(self, previous, context):
         """Return a boolean stating if a new block is to be created.
 
         # Arguments
 
         - previous: the songbook.content.Content object of the previous item.
+        - context: TODO
 
         # Return
 
@@ -37,11 +39,11 @@ class Content:
         """
         return True
 
-    def begin_block(self):
+    def begin_block(self, context):
         """Return the string to begin a block."""
         return ""
 
-    def end_block(self):
+    def end_block(self, context):
         """Return the string to end a block."""
         return ""
 
@@ -73,7 +75,8 @@ def load_plugins():
                 plugins[key] = value
     return plugins
 
-def render_content(content):
+@jinja2.contextfunction
+def render_content(context, content):
     rendered = ""
     previous = None
     last = None
@@ -83,15 +86,15 @@ def render_content(content):
             continue
 
         last = elem
-        if elem.begin_new_block(previous):
+        if elem.begin_new_block(previous, context):
             if previous:
-                rendered += previous.end_block() + EOL
-            rendered += elem.begin_block() + EOL
-        rendered += elem.render() + EOL
+                rendered += previous.end_block(context) + EOL
+            rendered += elem.begin_block(context) + EOL
+        rendered += elem.render(context) + EOL
         previous = elem
 
     if isinstance(last, Content):
-        rendered += last.end_block() + EOL
+        rendered += last.end_block(context) + EOL
 
     return rendered
 
diff --git a/songbook_core/content/section.py b/songbook_core/content/section.py
index 8fb19527..f2cf4e89 100644
--- a/songbook_core/content/section.py
+++ b/songbook_core/content/section.py
@@ -20,7 +20,7 @@ class Section(Content):
         self.name = name
         self.short = short
 
-    def render(self):
+    def render(self, __context):
         if (self.short is None):
             return r'\{}{{{}}}'.format(self.keyword, self.name)
         else:
diff --git a/songbook_core/content/song.py b/songbook_core/content/song.py
index b9b13858..447d20b3 100644
--- a/songbook_core/content/song.py
+++ b/songbook_core/content/song.py
@@ -2,6 +2,7 @@
 # -*- coding: utf-8 -*-
 
 import glob
+import jinja2
 import os
 
 from songbook_core.content import Content
@@ -11,23 +12,24 @@ class Song(Content):
     def __init__(self, filename):
         self.filename = filename
 
-    def begin_new_block(self, previous):
+    def begin_new_block(self, previous, __context):
         return not isinstance(previous, Song)
 
-    def begin_block(self):
-       #TODO index return r'\begin{songs}{((indexes|default("")))}'
-       return r'\begin{songs}{titleidx,authidx}'
+    def begin_block(self, context):
+        indexes = context.resolve("indexes")
+        if isinstance(indexes, jinja2.runtime.Undefined):
+            indexes = ""
+        return r'\begin{songs}{%s}' % indexes
 
-    def end_block(self):
+    def end_block(self, __context):
         return r'\end{songs}'
 
-    def render(self):
+    def render(self, __context):
         return r'\input{{{}}}'.format(self.filename)
 
 def parse(keyword, config, *arguments):
     songlist = []
     if not arguments:
-        import ipdb; ipdb.set_trace()
         arguments = [
                 os.path.relpath(
                     filename,
diff --git a/songbook_core/content/songsection.py b/songbook_core/content/songsection.py
index 61d7b88d..c27a3a31 100644
--- a/songbook_core/content/songsection.py
+++ b/songbook_core/content/songsection.py
@@ -13,7 +13,7 @@ class SongSection(Content):
         self.keyword = keyword
         self.name = name
 
-    def render(self):
+    def render(self, __context):
         return r'\{}{{{}}}'.format(self.keyword, self.name)
 
 def parse(keyword, config, *arguments):