Claim: Vienna Waltzes is a ballet made by George Balanchine (known as the father of American ballet, he co-founded the New York City Ballet and remained its Artistic Director for more than 35 years) which casted ballerinas such as Karin von Aroldingen, and Sara Leland, but did not include Kay Mazzo despite being one being out of the famous ones at the time.
Evidence: Kay Mazzo "Gold and Silver Waltz"