When you only listen to the top 40, you're letting the crowd decide what you hear.
And if you consume nothing but the most liked, the most upvoted, the most viral, the most popular, you've abdicated responsibility for your incoming. Most people only read bestselling books. That's what makes them bestsellers, after all.
The web keeps pushing the top 40 on us. It defaults to 'sort by popular,' surfacing the hits, over and over.
Mass markets and math being what they are, it's likely that many of the ideas and products you consume in your life are in fact, consumed because they're the most popular. It takes a conscious effort to seek out the thing that's a little less obvious, the choice that's a little more risky.
Popular is not the same as important, or often, not the same as good.