What anime openings stand the test of time across eras and recent gems?

[JamesB]

I'm putting together a playlist of iconic anime openings to introduce a friend to the genre, and I'm realizing how many legendary tracks are tied to specific eras and emotional moments in their series. I want a mix that showcases incredible animation sequences paired with unforgettable music, from the pure hype of classic shonen battles to the hauntingly beautiful intros of psychological thrillers. For long-time fans, what openings have stood the test of time for you beyond pure nostalgia, where the song and visuals perfectly encapsulate the show's core themes? Which recent series, say from the last five years, have produced openings you believe are already all-time greats in terms of artistic direction and musical synergy?