我遇到了 TypeError 问题：

function artist(name) {
    this.name = name;
    this.albums = new Array();

    this.addAlbum = function(albumName) {
        for (var i = 0; i < this.albums.length; i++) {
            if (this.albums[i].name == albumName) {
                return this.albums[i];
            }
        }

        var album = new album(albumName);
        this.albums.push(album);

        return album;
    }
}

function album(name) {
    this.name = name;
    this.songs = new Array();
    this.picture = null;

    this.addSong = function(songName, track) {
        var newSong = new songName(songName, track);
        this.songs.push(newSong);

        return newSong;
    }
}

出现以下错误：

TypeError: album is not a construction

我找不到问题所在。我读了很多其他帖子，但没有找到类似的问题。难道是不允许在另一个对象中创建对象？我该如何解决这个问题？