Han spilte også orgel for Philadelphias Christ Church og komponerte eller redigerte en rekke hymner og salmer, blant annet «A Collection of Psalm Tunes with a few Anthems and Hymns Some of them Entirely New, for the Use of the United Churches of Christ Church and St. Peter's Church in Philadelphia» (1763), «A psalm of thanksgiving, Adapted to the Solemnity of Easter: To be performed on Sunday, the 30th of March, 1766, at Christ Church, Philadelphia» (1766), og «The Psalms of David, with the Ten Commandments, Creed, Lord's Prayer, &c. in Metre» (1767).