The Rev. Matiya Nkhoma and his wife, Mariya, harmonize on a Christmas carol in their native Chitonga language. The song, "Ndi Usiku Yinguvwika," a title that roughly translates to "Song of the Angels," relates the message angels sang on the night of Jesus' birth. The couple from Malawi, Africa, sang the carol Sunday, Dec. 28, 2008, to the congregation at Westminster Presbyterian Church in Chehalis during the start of a six-month visit to Western Washington on a pastor exchange program.