the music and dance starts first at the new year's party.为何用starts第三人称单数?

the music and dance starts first at the new year's party.为何用starts第三人称单数?
the music and dance starts first at the new year's party.为何用starts第三人称单数?

the music and dance starts first at the new year's party.为何用starts第三人称单数?
前面的定冠词the,要是the music and the dance 就要用start了