The term 'CLASSICAL MUSIC VENUE' can be summarized by the crossword solution 'ODEON', which is a five-letter word. An ODEON is a type of theater or concert hall that is used for the performance of classical music. It is typically a large, ornate building with a stage and seating for an audience. Odeons have been around since ancient Greece, where they were used for musical performances and other forms of entertainment. Today, they are still used for classical music performances, as well as other types of events.