OMG Cassidy does Sumner. Is there no bottom to this barrel?

Who or what is or was Sumner?

Cassidy's songwriting doesn't do much for me, but she did have a remarkably beautiful voice and her guitar playing fitted it perfectly. My reaction to her was much like Lizzie's.

Whereas Eddi Reader comes across to me like a Susan Boyle without the mental retardation to excuse the tastelessness.