As Helen says, there are plenty of songs about breath and breathing, but the one that came immediately to mind was this version by The Hollies of an Albert Hammond/Mike Hazlewood song.
No coincidence that this came out in 1974, the year we got married. A beautiful song for a beautiful woman.
If I could make a wish
I think I’d pass
Can’t think of anything I need
No cigarettes, no sleep, no light, no sound
Nothing to eat, no books to read
Making love with you
Has left me peaceful, warm, and tired
What more could I ask
There’s nothing left to be desired
Peace came upon me and it leaves me weak
So sleep, silent angel, go to sleep
Sometimes, all I need is the air that I breathe
And to love you
All I need is the air that I breathe
Yes to love you
All I need is the air that I breathe
Peace came upon me and it leaves me weak
So sleep, silent angel, go to sleep
the only deadhead in the hameau 
What a beautiful song and a beautiful tribute. Thank you so much for sharing it!
Aw, this is a beautiful one.