The term 'Song of Sorrow' is a poetic phrase used to describe three different types of musical compositions: an ELEGY, a LAMENT, and a DIRGE. An ELEGY is a mournful poem or song expressing sorrow or lamentation, usually for the dead. A LAMENT is a passionate expression of grief or sorrow. Lastly, a DIRGE is a slow, mournful song or tune expressing sorrow or mourning. All three of these musical compositions are used to express sorrow and grief.