SAEWEB2.2/ci/application/controllers/Albums.php

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Albums extends CI_Controller {

    public function __construct(){
        parent::__construct();
        $this->load->model('model_music');
    }

    public function index(){
        $albums = $this->model_music->getAlbums();
        $this->load->view('layout/header');
        $this->load->view('albums_list', ['albums' => $albums]);
        $this->load->view('layout/footer');
    }

    public function view($album_id){
        $songs = $this->model_music->getSongOfAlbum($album_id);
        if (empty($songs)) {
            $songs = []; 
        }
        $this->load->view('layout/header');
        $this->load->view('song_album_list', ['songs' => $songs, 'album' => $album]);
        $this->load->view('layout/footer');
    }
}
?>