music: Metallica's song about the Jews in Egypt?

Questions

- A Christian song of praise sung by a congregation with words specially written.?

(Fr., 'fixed idea') - Berlioz' term for motto theme which means a recurring theme in a composition used (e.g. in his Symphonie Fantastique).?

- A literary term for a work of pastoral or peaceful nature and transferred to music (e.g. Siegfried Idyll by Wagner).?

- Descriptive music evoking a poem, novel, play, painting emotion or other non-musical source. More common term is programme music.?

- A device in part-writing in which one voice repeats (or approximately repeats) a musical figure previously stated by another voice. Canon and fugue employ imitation with strict rules.?