背景音乐填写格式如下：

{
    name: "Good Night",
    artist: "佐々木李子",
    url: "https://music.163.com/song/media/outer/url?id=1421195795.mp3",
    cover: "https://p1.music.126.net/q_KRhoe1QoFitH0l3d7MNQ==/109951164680294669.jpg?param=130y130"
},
{
    name: "木枯らしセンティメント",
    artist: "斎藤千和",
    url: "https://music.163.com/song/media/outer/url?id=28838594.mp3",
    cover: "https://p1.music.126.net/NJrE-f6zss9I2iQpxXhsKA==/5963751069591679.jpg?param=130y130"
},
{
    name: "Timeless time",
    artist: "川田まみ",
    url: "https://music.163.com/song/media/outer/url?id=592232.mp3",
    cover: "https://p1.music.126.net/kSOJcPGGMOFFg4GzM7FnFg==/793847395298303.jpg?param=130y130"
}

name为歌曲名字，artist为歌手，url为歌曲链接建议使用mp3格式，cover为封面图地址