Jim, the "Loving Lamb" tune is named HARP in a Japanese hymnal, with Watt's ""When I can read my title clear". The composer is Stephen Jenks (1772-1856). Midi is here (No. 330). According to Wasson's Hymntune Index, the tune name is COMMUNION (also called RESIGNATION) in The Brethren's Tune and Hymn Book, 1872.