Best American music of the last 25 years?

What songs and artists best represent American music over the past 25 years?

I am making a mega playlist for my friend immigrating to the States next month. She loves English music but it's heavily censored where she is from. What are the best songs to help her catch up to date on popular genres and show her the best songs of the last 25 years?

Bonus points for songs that cover the plight of generations or relevant sociopolitical situations at the time.