I don't have to guess. I've had that CD for years. I even knew one of his fellow cast members!! (A darling old flirt of a character actor named George S Irving)
He had this to say:
So you want to know about Ross Martin? Makes me feel like a scene from "Citizen Kane". He and I worked together in a musical called "Archie and Mehitabel" [note: later changed to Shinbone Alley}. He was an extraordinary actor with a marvelous technique. He could imitate the great British "Sirs"' Olivier, Richardson and Gieldgud - and the Queen for good measure! Impeccably. He was a very emotional man - would tell me his woes and sometimes burst into tears of frustration. We both hated the show but did our best and paid the rent. I was glad he became successful in California and perhaps found contentment at long last. We lost touch at that point but I was glad of our brief friendship.