One of Tempe’s nine sister cities is Regensburg, Germany, at the confluence of the Danube and Regen rivers in Bavaria. And one of the prides of Regensburg—along with having Tempe, Ariz., for a sister city—is the Regensburger Domspatzen, the boys choir of Regensburg Cathedral. The boys of the Domspatzen could perhaps be considered nephews of Tempe, and in April their American relatives got to babysit them for a few eventful days—and let them sing for their keep. One of the oldest and most respected boys choirs in Europe, the Domspatzen (“Cathedral sparrows”) traces its lineage back to 975 A.D.