Yes, the merry go round is the oldest amusement ride that people can still use.
Lack of independence. Opposite of dependent.
IMPROVISATION
Musical improvisation, also called musical extemporization, is the invention of music “in the moment”. Improvisation enables the performer to communicate and interact with other musicians promptly, spontaneously, and naturally. Musical harmony, melody, rhythm or any component is immediately created automatically.
We can tell that Fortunato maybe probably a practical joker of some sort, since "the thousand injuries of Fortunato I had borne as I best could" though probably not any lasting harm. But, then Fortunato did something truly bad... actual insult that Montresor thought hurt his very sense of honor.