Misc: Where is the 'whispering gallery'?

Questions

- (1) A subordinate passage serving as a link to another more important one. (2) A sudden change of key not going through the normal procedures referred to as modulation.?

- The writing down or performing of music in a different key from the original. ?

- Instruments that produce different notes than those written in concert pitch.?

(Ger.) - Sad.?

- (1) Treble clef. G clef on the second line; (2) Prefix to an instrument of high pitch within a family (e.g. treble recorder).?