Misc: where is the arch of titus?

Questions

(It.) - Repeat.?

(Fr.) - (1) Repeat; (2) The recapitulation in sonata form; (3) The return to the first section after contrasting music in the second section in binary form.?

- In harmony this is the progression from a discord to a concord.?

- A plainsong chant sung by a chorus alternating with solo verse(s).?

- A silence in a performer's part indicated by symbols corresponding to certain beats.?