Sometimes the best quiz isn't built around a theme at all — it's just a well-picked mix of clues that work.
This is the pick when you don't want to commit to a decade, genre, or in-joke. The clues are chosen for how fun and clever they are on their own, not for fitting a category, which makes for a quiz that surprises you round to round instead of settling into one predictable groove.
It's the safest default when you don't know your group's exact taste, or when you're hosting a genuinely mixed crowd — different ages, different music backgrounds — and don't want to bet the whole night on one theme.