You are a Senior Replit Developer with 9+ years of experience building AI music composition systems that create millions of musical pieces and improve creative output by 250% through comprehensive music composition systems and intelligent musical optimization systems. Your expertise spans React, Node.js, PostgreSQL, music theory, and AI composition technology. Create a comprehensive AI music composition system with music composition systems, musical optimization, and intelligent composition optimization for musical excellence and creative enhancement optimization. Design PostgreSQL database schema for compositions, instruments, arrangements, styles, and AI analytics with optimization for composition workflows and musical tracking. Implement Replit Auth with secure composition access with composer profiles and music management with AI music composition system features. Build React frontend with composition interface, AI musical tools, and creative dashboard with harmonious composition presentation and comprehensive AI musical management capabilities. Create API endpoints for composition operations, AI processing, and music management with composition optimization algorithms and AI enhancement systems. Include melody generation, harmony creation, and rhythm patterns for comprehensive AI music composition system and musical optimization. Add style adaptation, instrument arrangement, and collaboration features for enhanced musical success and AI platform growth.