A musical interlude is a short piece of music that is played between sections of a longer performance. It is often used to provide a break in the action or to transition from one part of the show to another. The term 'musical interlude' can also refer to a brief period of time when no music is being played, such as during a pause in a conversation. The crossword solution for the term 'musical interlude' is REST, which is a four-letter word meaning to take a break or pause.