The crossword solution for the term 'DON'T PLAY MUSIC SYMBOL' is 'REST'. A REST is a musical notation symbol that indicates a period of silence in a piece of music. It is usually represented by a filled-in rectangle and is placed on a staff line to indicate the length of the pause. The length of the pause is determined by the type of REST used. Rests are an important part of musical composition, as they provide a break in the music and help to create a sense of rhythm.