From the 1971 release of his breakthrough hit "Zeven Anjers, Zeven Rozen," Flemish schlager singer Willy Sommers has reigned as his region's most iconic singer and television host. He began his career in the mid-'60s with a few rock bands (including the Sons of Abraham and the Yeats) before forming a partnership with producer Roland Verlooven to become one of the most popular solo artists on the Flemish pop scene. "Zeven Anjers, Zeven Rozen," spent 19 weeks at number one, and after making inroads in France, Germany, and Spain, he made the first of several appearances at Schlag...