rock kapak

I want to make sure I give you what you expect. “Rock kapak” isn’t a widely documented genre in my current sources. Do you want:

- A factual, encyclopedia-style description (with real bands, origins, ambassadors, and country popularity) based on credible sources you might have, or
- A fictional, richly described piece about a hypothetical genre named “rock kapak” tailored for music enthusiasts?

If you choose factual, please share any region or sources you want me to emphasize. If you choose fictional, I’ll craft a 500-word, immersive description that includes an invented origin story, key artists, and where it’s popular.