Longman Dictionary of Contemporary English - commentary

~ n 1 a spoken description of an event, given while the event is happening, especially on the television or radio  (Stop shouting! I can't hear the baseball commentary.) + on  (Do they have a commentary on the parade?) running commentary (=a continuous description of something) 2 something such as a book or article that explains or discusses a book, poem, idea etc  (political commentary) 3 be a sad commentary on to be a sign of how bad a particular situation is  (The whole incident was a sad commentary on the state of British football.)