Years ago I was told that someone (Eydie Gorme?) had made a record in the early '60s, possibly under a pseudonym, where she purposefully sang every song a half-tone flat, as a joke. Has anyone else heard of that?
At a guess, you might be thinking of the strange career of Mrs. Miller. The William Hung of her day, she was a middle-aged housewife with aspirations to opera, whose producer coaxed her into recording several hit albums of pop-culture standards in the 1960's. The majority of her appeal was based on the modesty of her talents, and she later accused her producer of deliberately making her sound worse than she actually was.