According to Songfacts, Dave Grohl (Foo Fighters frontman) said ‘Everlong’ is about “being connected to someone so much that not only do you love them physically and spiritually, but when you sing along with them you harmonize perfectly.” Dave Grohl wrote the song at a low point in his life when he had broken up with his ex-wife and was sleeping in a sleeping bag on a friend’s floor.  It was written in 45 minutes as a love song to his ex.