Why is this church choir wearing hard hats?

Hear the hymn written for the dedication of the Holy Name of Jesus Cathedral in Raleigh on Wednesday. It was commissioned by Bishop Michael Burbidge, composed by Michael J. Accurso, Diocesan Director of Sacred Music and performed by The Raleigh Diocesan Choir. The hymn has 10 verses available in 8 of the languages spoken in the Diocese of Raleigh including English, Spanish, French, Igbo, Swahili, Vietnamese, Korean, and Tagalog. …