Why the bass is so important to music in general, even though it doesn’t sound loud in most songs?

Question

I feel it “fills” the song but I dont know how to express this in better words

In:

Answer 1

Filling the song is actually quite a good way to think about it. It’s not about loudness, it’s more like the foundation of a building. You need to be able to build *on* something.

For example, imagine [this song](https://www.youtube.com/watch?v=IuezNswtRfo) without the bass. Without the bass there is no song.