             systemName: "music.note", action: #selector(didTapLibraryButton), style: .body)
         let cloudButton = createButton(
             systemName: "icloud.fill", action: #selector(didTapCloudButton), style: .body)
-        listButton = createButton(
-            systemName: "list.dash", action: #selector(didTapListButton), style: .body)
 
         let routePickerView = AVRoutePickerView()
         let volumeSlider = MPVolumeView()

        mediaController.nextTrack()
    }

    @objc private func didTapListButton() {
        let viewController = UIViewController()
        viewController.view.backgroundColor = .systemBackground
        present(viewController, animated: true, completion: nil)
    }

    @objc private func didTapLibraryButton() {
        let picker = MPMediaPickerController(mediaTypes: .anyAudio)
        picker.delegate = self

    private let mediaController = MediaController()

    private var playbackButton: UIButton!
    private let backgroundImageView = UIImageView()
    private let albumImageView = UIImageView()
    private let songLabel = MarqueeLabel(frame: .zero, duration: 8, fadeLength: 8)
