Producer Anant Singh revealed Tuesday that Barry Gibb, co-founder of the Bee Gees, has composed the song “Angels” for Oliver Schmitz’s “Shepherds and Butchers,” which will have its world premiere at the Berlin Film Festival on Feb. 13. “Shepherds and Butchers,” which stars Steve Coogan (“Philomena”), Andrea Riseborough (“Birdman”) and Garion Dowds, is set at...