The crossword solution for the term 'SAL OF SONG' is GAL. This term is a reference to the traditional folk song, 'The Gal I Left Behind Me, ' which was popular in the United States during the 19th century. The song tells the story of a soldier who is leaving his sweetheart behind and expresses his sorrow at having to part from her. The term 'Sal of Song' is a play on words, referring to the soldier's sweetheart as the 'gal' he left behind.