By Steve Gorman LOS ANGELES (Reuters) - Mike Douglas, the affable big band singer who for two decades hosted a parade of America's biggest stars and newsmakers on his top-rated daytime talk show, died on Friday on his 81st birthday, friends said. ADVERTISEMENT Douglas, an Irish tenor on the verge of quitting show business before landing the TV show that made him a household name, died at a hospital in North Palm Beach, Florida, according to business associate Bob Patterson. Patterson said he had no details about the circumstances of the entertainer's death. Born Michael Dowd in Chicago in 1925,...