The difficult operatic arias that Jenkins chose to perform—all well beyond her technical ability and vocal range—served only to emphasize these deficiencies. "There's no way to even pedagogically discuss it," said vocal instructor Bill Schuman. "It's amazing that she's even attempting to sing that music." The opera impresario Ira Siff, who dubbed her "the anti-Callas", said, "Jenkins was exquisitely bad, so bad that it added up to quite a good evening of theater... She would stray from the original music, and do insightful and instinctual things with her voice, but in a terribly distorted way. There was no end to the horribleness... They say Cole Porter had to bang his cane into his foot in order not to laugh out loud when she sang. She was that bad." Nevertheless, Porter rarely missed a recital.