Talk about a well-kept secret… Throughout his too-short life, vocalist Warren Wiebe (1953-1998) never became a household name.  Yet he was highly successful.  As a background singer, he graced recordings by Johnny Mathis, Paul Anka, Taylor Dayne, and Air Supply.  A true songwriter’s singer – able to convey the heart and soul of a song without resorting to self-indulgence – he earned the respect and admiration of a “Who’s Who” of songwriters who enlisted him to introduce their songs on private demonstration recordings.  Among Wiebe’s biggest fans were Burt Bacharach, David Foster,…