What does Nehemiah 11:17 mean?

Mattaniah, son of Mica, grandson of Zabdi, and descendant of Asaph, led the prayers of thanks. Bakbukiah was his assistant, and Abda, son of Shammua, grandson of Galal, and descendant of Jeduthun, was also among the Levites. Nehemiah 11:17 - Modern Text Bible

(Mattaniah led the thanksgiving prayers, with Bakbukiah and Abda assisting. Their roles show the importance of worship and music.)