(cont. from prev. post below...)
Chess I have heard referenced as a sport many times in common usage (I used to play every day for several years). In fact, chess is explicitly recognized as a sport by the International Olympic Committee. Although I have never personally heard the game of Scrabble called a sport, I speculate it too is considered such amongst those who are serious about the game.
Despite the dictionary technically allowing music to be named a sport, I would say (continuing to maundering in the dimly-lit and ill-defined realm of subjective speculation here...) this would be poor usage. Why? Without getting into the finer points of semantics (in the interests of brevity

, and with the expectation that you will get what I am saying without further elaboration), simply put, because music, to my way of thinking, is an art, not a sport.