We're assuming, of course, that Catherine IS the operatic Catherine Foster...

I recall a programme hosted, many years ago on Radio 2, by the jazz saxophonist and jazz critic the late Benny Green. He was discussing the then trend of opera singers to get involved with other forms of musical and, in particular, was comparing a recording of Kiri Te Kanawa (as Nellie Forbush) to the singing of Mary Martin. His fairly scornful comment, after playing the two versions of "I'm gonna wash that man right out of my hair", was Kiri Te Kanawa just couldn't cut it. She had good classical operatic training, a superb voice, etc. - but that essential, hard-to-define "it". In other words, different musical genres require different approaches and techniques - and critiques.