Answer:
The different elements of music as found in Britten's Young Person's Guide to the Orchestra are the following ones:
Theme and variations: form (form is actually a theme with many variations)
Full orchestra: performing forces (individual or collective intruments)
Marching Band: rhythm
Homophonic throughout: texture (the texture of a unique melody with the accompaniment of some instrument)
Ternary (A-B-A): form (form can be described as ternary or binary, wheter it has two or three elements)
Homophonic at the beginning and polyphonic at the end: texture
based on a Baroque tune: melody (Based on Baroque composer Henry Purcell)
