The comparison of music to a golden curve suggests that the composer has created a piece of music that can be compared to a precious, finely crafted object made of gold. It conjures up the idea that the music is a thing of beauty, something to be admired and savored. The word "curve" suggests that the music is fluid, with gradual changes and shifts. It may rise and fall in intensity and mood, much like a curve.
It is also possible that the phrase "music like a curve of gold" is describing music that is bright and happy. Gold is often associated with warmth and radiance, and music that is like a "curve of gold" may have a similar feel to it. Such music may make the listener feel upbeat, happy, and uplifted.
Ultimately, what music like a curve of gold means depends on the context and interpretation of the individual. It is a metaphorical description that opens up the possibilities for varied meanings and interpretations, inviting the listener to perceive the beauty, complexity, and impact of music in its many forms.