Collocations for theme - noun

basic, central, dominant, important, key, main, major, overriding, underlying
broad, general, overall
common, popular, universal
universal themes of love and loneliness

consistent, constant, familiar, favourite/favorite, recurrent, recurring
related
overarching, unifying
contemporary
historical, religious, etc.
campaign, conference, research
musical
The movie's haunting musical theme stayed in my head for days.

address, continue, develop, discuss, examine, explore, have, introduce, reflect
His later novels develop the theme of alienation.

warm to (esp. BrE)
‘Our work’, he continued, warming to his theme, ‘will be a milestone in scientific history.’

identify

emerge
Several familiar themes emerged from the discussion.

run through sth
The same themes run through all her novels.

music, song (esp. AmE), tune (esp. BrE)
park, pub (BrE), restaurant
party

on the theme of
He gave a talk on the theme of teenage unemployment.

variations on a theme
Most of the essays appear to be variations on a few central themes.