Act as a visionary architect with expertise in surreal urban design. Create a detailed blueprint for a fantastical city where every building is a fully functional, giant musical instrument. The city should be divided into distinct [DISTRICTS], each representing a different [MUSICAL GENRE] (e.g., classical, jazz, electronic). Describe the [MATERIALS] used in construction, how the instruments produce sound (e.g., wind, percussion, strings), and how citizens interact with them in daily life. Include at least three landmark structures, their unique acoustic properties, and how they contribute to the city's cultural identity. Ensure the design is both aesthetically stunning and acoustically innovative.