Folk hymn arrangements for voices and instruments (flexible arrangements)

My shepherd will supply my need, Silent night, I wonder as I wander, Were you there when they crucified my Lord? and How can I keep from singing? for flexible combinations of vocal solo/duet, unison, 2-, 3- or 4-part choirs, piano solo or duet/organ and optional instruments, starting with violin, flute, clarinet and cello. They