“The Dale Warland Singers, a bedrock of Twin Cities culture for three decades and regarded among America’s most influential choirs, will no longer perform after the group’s namesake steps down as director following the 2003-04 season. Dale Warland, 71, told his singers Thursday night he is leaving the group, which he formed in 1972, to concentrate on teaching and guest-conducting opportunities around the country and spend more time with family. The singers, who had long braced themselves for Warland’s inevitable departure, were stunned to learn the choir is disbanding.”