You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For consistency, answers should be in all lower cased letters.

Category: THE SOUND OF MUSIC 
Clue: Poetically, tones are sometimes described adjectivally as this, from the Latin for "sweet"
dulcet

Category: CAPITAL 
Clue: Yokusuka & Yokohama lie on the same harbor as this capital
tokyo

Category: SO YOU'VE JOINED THE NAVY 
Clue: Not surprisingly, it's specified that to complete training you must be able to do this for 50 meters

swim