What is the appositive phrase in the sentence Marquita Jones the leader of the band missed the concert.?

In the sentence "Marquita Jones, the leader of the band, missed the concert," the appositive phrase is "the leader of the band." This phrase provides additional information about Marquita Jones and identifies her role within the context of the sentence. It is set off by commas to indicate that it is not essential to the main meaning of the sentence.