倒装句还原!The earliest forms of art,like painting and music,are

这句话我认为原句不是倒装句,就是主系表的结构：
The earliest forms of art 是主语
like painting and music 是插入语,补充说明主语
are those best suited for expressing joy 是系表结构作谓语
译文：最早的艺术形式（图画和音乐之类）都是那些最适于表达欢乐的.
另外,楼主如果要把表语和主语调换,未尝不可.应该把like painting and music放到最后,因为这个词组是用来补充说明the earliest forms of art的.