This is an all around wonderful movie. The writing, acting, and production were off the charts. The two standout aspects were the original music, and the two story arcs.
The music was all composed by the writer/director. Not only was he able to create new music that informed the plot and moved the storyline forward; he also wrote beautiful songs that would sell and win awards.
The two main character story arcs parallel each other, mirror each other, and have a very unique retrograde inversion of each other. Not only are the two characters story arcs interacting with each other and informing the others choices; but they are a beautifully artistic reverse of each other. It creates the effect of a beautiful form usually only present in the most masterful music.