Marguerite enters , pondering her encounter with Faust at the city gates , and sings a melancholy ballad about the King of Thule ( `` Il était un roi de Thulé '' ) .
Marguerite enters , pondering her encounter with Faust at the city gates , and sings a melancholy ballad about the King of Thulé ( `` Il était un roi de Thulé '' ) .