This is a beautiful song. Its basically about two different people who are crazy about someone and they are trying to tell the person that living without them is like living in a world without air. They want the other to not realize how they feel so they sing to their love to try and explain what is going through their mind. This song is great because so many people can relate to this feeling whether it be about a bf/gf, husband/wife, or crush. Even I feel this way about someone. Love is such a mysterious and powerful thing.