I am not a physicist, but I am wondering if light is a good example to explain a spectrum. My primary concern is, that light indeed has a primary order (wave l

I am not a physicist, but I am wondering if light is a good example to explain a spectrum. My primary concern is, that light indeed has a primary order (wave length) and composition of wave lengths isn't being talked about here. While thinking about an alternative example, I came across sound. Frequency also plays a role, but here the composition of different frequencies is important to create melodies. The presents of different frequencies could be the equivalent of a factor being strong or weak. What do you think, do you have other ideas/examples/thoughts?