What is the fine-grained topic of the following text: The cube is wrapped it up in several layers of PVC-film, which was then peeled off in the shape of waves to reveal the wooden core, much like layers of synth and electronics are added to the band’s musical core, which is a traditional band using guitars, drums and keyboards. Only return the topic.
The comparison of a band's music production process to unveiling a cube wrapped in PVC film.