Implement Initial Creative Brief Task

Implement the CrewAI agents and tasks to process an initial creative brief. The Lyricist Agent should generate evocative lyrics based on genre, mood, and theme using Claude Opus 4.1. The Composer Agent should propose a basic song structure. Ensure both agents communicate their outputs to a 'Reviewer' or 'Producer' agent. Integrate a dummy tool for 'melody generation' that returns a placeholder string.