theme

melodic subject of a musical composition

“the theme is announced in the first measures”

an essay (especially one written as an assignment)

the form of a word after all affixes are removed

the subject matter of a conversation or discussion

“his letters were always on the theme of love”

a unifying idea that is a recurrent element in literary or artistic work

“it was the usual `boy gets girl' theme”

provide with a particular theme or motive

“the restaurant often themes its menus”