I think that commercials can really ruin a song. You know that the person sold the song for a good deal of money, and that was the tradeoff. But, music and picture can marry in a beautiful way, and the reverse also.
David LynchWhen you get an idea, so many things come in that one moment. You could write the sound of that idea, or the sound of the room it's in. You could write the clothes the character is wearing, what they're saying, how they move, what they look like. Instead of making up, you're actually catching an idea, for a story, characters, place, and mood - all the stuff that comes.
David Lynch