Speaking to Billboard magazine in a track-by-track interview, Mraz explained the song's meaning: "'Everything Is Sound' is a song simply about the joy of singing and how in my experience in life, or my perspective in life, is about vibrating at a high frequency," he said. "If you look at the world through a microscope, you'll see that everything's vibrating and its that vibration that forms mass and I think that is at the core of everything that we do. This to me, while it's a big sing-a-long pop song, its actually quite a sacred song to me. Just about the joy of singing, making joyful noise."
This song was inspired by the practice of kirtan, which is group chanting, often accompanied by instruments. Kirtan is associated with Eastern philosophies and yoga, but has become somewhat popular in Western culture as well, with proponents like Krishna Das drawing hundreds to his performances. Kirtan and yoga are a big part of Mraz' lifestyle; he's talked about how his practice gives him "wings" and opens his mind for songwriting.