也就是说所有一个单词组成的歌曲，Billboard总排名21
21 Fallin Alicia Keys
完整榜单：
http://www.billboard.com/articles/list/5944890/top-50-single-word-songs-one-word-wonders
21 Fallin Alicia Keys
完整榜单：
http://www.billboard.com/articles/list/5944890/top-50-single-word-songs-one-word-wonders
