for (ContentList::iterator i = _content.begin(); i != _content.end(); ++i) {
_content_connections.push_back ((*i)->Changed.connect (bind (&Playlist::content_changed, this, _1, _2, _3)));
}
for (ContentList::iterator i = _content.begin(); i != _content.end(); ++i) {
_content_connections.push_back ((*i)->Changed.connect (bind (&Playlist::content_changed, this, _1, _2, _3)));
}