Misc: Who married both Margaret Kempson and Margaret Roberts?

Questions

- Fifth degree of the major or minor scale, or a triad built on it.?

- Dominant triad with the addition of the seventh note from its root. ?

- At double the speed of the preceding sectlon .?

- Two bar lines placed closely together to signify the end of a composition or section.?

- Invertible counterpoint in two parts occurring frequently in fugues.?