Answer:

THEMES

Answer	Crossword Clue
THEMES	Topics of discourse
THEMES	Musical motifs
THEMES	School assignments

THEMES	Main ideas
THEMES	Subject matters
THEMES	English class writings
THEMES	Unifying concepts
THEMES	Motifs
THEMES	Crossword features, usually
THEMES	Topics
THEMES	Dominant ideas

THEMES	Main points
THEMES	Signature songs
THEMES	Unifying ideas
THEMES	Central ideas
THEMES	Compositions.
THEMES	Topics.
THEMES	Subjects.
THEMES	Melodic subjects.

THEMES	Essays.
THEMES	Signatures, in radio.
THEMES	Short essays.
THEMES	School papers.
THEMES	Motifs.
THEMES	Class papers
THEMES	Leitmotifs
THEMES	School chores

THEMES	English assignments
THEMES	Students' assignments
THEMES	School compositions
THEMES	Students' essays
THEMES	Subjects
THEMES	Classical music features
THEMES	School papers
THEMES	Concept album features

THEMES	All great crosswords have them
THEMES	Connected thoughts
THEMES	What many crossword puzzles have
THEMES	Some amusement parks have them
THEMES	All USA TODAY crosswords have them