The Esipode of Clannad was composed and arranged by Shinji Orito, a Japanese musical composer originally from Hyōgo, Japan working for the software company Key. Before forming Key, Orito worked for another software company named Leaf where he contributed to four games.
The Esipode of Clannad, was first released in Japan by Key Sounds Label. It is a sad song. When people who heard this song, he or she could not help shedding tears.
So, The Esipode of Clannad, AIR and KANON were known as the three tear song in Key Sounds Label.