server {
    listen 80;
    server_name your-domain.com;
    
    location /audio/ {
        alias /path/to/your/audio/files/;
        if ($request_filename ~* \.mp3$) {
            add_header Content-Disposition "attachment";
            add_header Content-Type "audio/mpeg";
        }
        
        add_header Access-Control-Allow-Origin "*";
    }
}