There are many different synonyms for the phrase "sad song," each evoking a slightly different feeling or emotion. A tear-jerker is a song that is so emotionally poignant that it brings tears to the listener's eyes. A dirge is a mournful song that is often played at funerals or other somber occasions. A lament is a song of lamentation, expressing feelings of loss or grief. Other synonyms for sad songs include elegy, requiem, ballad, and blues. Whichever term you choose, each one conveys a sense of sadness and sorrow that can be incredibly moving and cathartic.