Sound doesn't always have to be heard. Sound can also be created by how a pattern is set up on a surface- how it moves across the surface, how light reflects the surface [and] can generate a feeling. Sound can also be through feeling, through color, through texture.
Nick CaveThere's that kind of song, "Whoah baby, I love you," which doesn't have a visual element, but a very strong emotional element, and these are the great songs to me - those ones that you put them on and they just make you feel great, or whatever.
Nick Cave