“The Levites returning were Jeshua, Binnui, Kadmiel, Sherebiah, Judah, and Mattaniah, who with his associates, was in charge of the songs of thanksgiving. Bakbukiah and Unno, and their associates, stood opposite them in the service.”
Jeshua was the high priest with Zerubbabel. The house of Jeshua returned with the original group in Ezra, chapter 2. There is no mention here of the Immer group, the Pashhur group, the Harim group, and the Hodaviah group. However, the Kadmiel group is mentioned here, while Sherebiah, Judah, and Mattaniah are added here. Bakbukiah and Unno are new here also. They stood opposite them which might refer to antiphonal singers, but it is not definitive.
Eugene Finnegan Bible Project 