What are the dominant themes in Bollywood films of various eras?

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During the 1930s and 40s-Patriotic themes and movies on social issues 1950s: Romantic musicals and melodramas 1960s: Romantic musicals and thrillers 1970s: Romance takes a back seat as action emerges particular from mid 70s. 1980s: Masala movies and action fare 1990s: The return of romantic musicals with family-centric themes 2000s: Innovative and experimental storylines. No particular theme, movies are based to capture a broader set of audience.