Maine’s bicentennial hymn, “On Christ the Solid Rock“, using the tune of Solid Rock (1863) with lyrics from the Rev. Maria Hoecker, Rector at St. Columba’s in Boothbay Harbor, is available here and on the Bicentennial page of the diocesan website. Permission for all followers of Jesus to share and sing this hymn with their neighbors in perpetuity for the Glory of God and without cost is granted! 
The author of the hymn tune, William Bradbury (1816-1868), was born in York, Maine. He was a prolific composer and taught music for a time in Machias, Maine. Here is a summary of his history and a long list of his compositions.