I hired Mr. Herzog to perform at a private party. He was to play for 2 1/2 hours. Apparently he suffered an injury to his back the day before the party and after playing for an hour and a half (with numerous breaks) informed me, as he was leaving, that he was unable to comply with the terms of the contract. Several guests commented on his inability to perform requests and his not completing the songs he was playing. He was clearly too ill to perform and should have informed me prior to the party so I could have made other arrangements. From the little I recall of his performance he was a competent pianist.