Steve watched Danny play, eventually deciding to move closer to his older brother and was practically sitting somewhat "beside" him. Of course, he gave him room to play, such talent needed personal space and concentration. As Danny played that beautiful piece of music, Steve thought about what it could symbolism or be thought in the human mind. Human life, from birth to death, conflicts of powers acting against each other, and other deep, personal meanings.
Continuing to watch silently, Steve just smiled at his older brother, happy that he was so talented and gifted...more than him anyways.