-            raise ExtractorError(u'Hypemachine contained invalid JSON.')
-
-        key = track[u"key"]
-        track_id = track[u"id"]
-        artist = track[u"artist"]
-        title = track[u"song"]
-
-        serve_url = "http://hypem.com/serve/source/%s/%s" % (compat_str(track_id), compat_str(key))
-        request = compat_urllib_request.Request(serve_url, "" , {'Content-Type': 'application/json'})
-        request.add_header('cookie', cookie)
-        song_data_json = self._download_webpage(request, track_id, u'Downloading metadata')
-        try:
-            song_data = json.loads(song_data_json)
-        except ValueError:
-            raise ExtractorError(u'Hypemachine contained invalid JSON.')
-        final_url = song_data[u"url"]
-
-        return [{
-            'id':       track_id,
-            'url':      final_url,
-            'ext':      "mp3",
-            'title':    title,
-            'artist':   artist,
-        }]
\ No newline at end of file
+            raise ExtractorError('Hypemachine contained invalid JSON.')
+
+        key = track['key']
+        track_id = track['id']
+        title = track['song']
+
+        request = sanitized_Request(
+            'http://hypem.com/serve/source/%s/%s' % (track_id, key),
+            '', {'Content-Type': 'application/json'})
+        song_data = self._download_json(request, track_id, 'Downloading metadata')
+        final_url = song_data['url']
+        artist = track.get('artist')
+
+        return {
+            'id': track_id,
+            'url': final_url,
+            'ext': 'mp3',
+            'title': title,
+            'uploader': artist,
+        }