Florence Foster Jenkins
From her recordings we can hear that Jenkins sang very out of tune and out of time.  She even wobbled a lot on one note. Her piano accompanist can be heard trying to change the speed to fit in with her mistakes.  Her words were unclear, especially when singing in a foreign language.  However, she became tremendously popular in her unusual way. Her audiences seemed to love her in spite of her unmusicality.  She always thought she was a good singer and compared herself to the great sopranos.   She knew the critics wrote bad things about her, but she said: "People may say I can't sing, but no one can ever say I didn't sing."