Misc: Who wrote Father Brown Mysteries?

Questions

(It.) - First. (1) Upper part of a piano duet, the lower part being termed sccondo; (2) The first of two or more performers (e.g. violino primo means first violin). (3) Tempo primo indicates that the original speed is to be resumed.?

(It.) - The chief castrato or tenor role, used in the 18th century.?

- (1) The first player of an orchestral section (e.g. the 'principal horn'). (2) In opera, the principal is the singer who performs the main parts, but not the chief ones.?

- Music which interprets or describes a story, painting, poem, landscape or emotional experience. Opposite of absolute music.?

- The movement from one note or chord to another in music.?