Abstraction and symbolism has been used by artists to represent objects in a visual form. Sound can also be represented through colour and this abstract method is relatively new to art, looking back through the past movement.
Classical music and the teachings of fellow artist Wassily Kandinsky are believed to be behind the work of O'Keeffe in Blue and Green Music. Specific colours in this painting would refer to certain sounds, perhaps even musical instruments.
Displaying sound as a visual form is an expressive form of art which fits well with the 20th century modern art movements.
Blues and greens dominate this work and the way in which these colours work together would suit a collection of sounds producing a beautiful symfony.