Clannad's ending is quite different to the opening. While the opening starts off slowly and quickly picks up speed, the ending's pace stays mostly the same thought. Having said that however, the ending is an absolutely beautiful song, both in terms of vocals and music. The song's lyrics are quite unusual, describing a family of dango (jam dumplings). I'm not quite sure what relation has to the main series, although i've heard that it somehow ties in with the main series - something to look out for.