Misc: With which country did Britain break off diplomatic relations in April 1984?

Questions

- The chord containing the sixth and third intervals from the bass note. Same as first inversion of a triad.?

(It.) - Becoming slower.?

- Device on some brass instruments, used principally on the trombone, for altering the length of the tube, and therefore the notes produced.?

- A curved line grouping notes together, indicating that they be joined smoothly in performance (eg. sung in one breath or played with one stroke of the bow, etc.).?

(It.) - Dying away.?