Well, you know how it is, you were born; that's why you're here.
You walk around, look at things, those things give you ideas. No big deal.
And then one day you hear a song and it's like a brick in your face.
All your ideas suddenly make so much more sense against the background of this song.
So you keep looking for more backgrounds...ANOTHER BRICK!
Some songs GIVE ideas.
Aaand you're hooked.