melodic theme(n = noun.communication) idea, musical theme, theme - (music) melodic subject of a musical composition; "the theme is announced in the first measures"; "the accompanist picked up the idea and elaborated it"
is a kind of air, line, melodic line, melodic phrase, melody, strain, tune
has particulars: motif, motive, statement, variation

melodic, melodic line, melodic phrase, musical theme, theme, theme and variations, theme park, theme song