The descriptive note comes from item A0090 in :
Cowden, Robert H.
Concert and opera singers
A bibliography of biographical materials
Compiled by Robert H. Cowden
Westport, Connecticut: Greenwood Press, c1985, 278 p.
This is what Robert H. Cowden had to say:
Intended as an educational work for aspiring singers, some twenty artists have been asked to give their own personal views based upon their experiences.
© Robert H. Cowden
(c) 2020. Frank Greene. All rights reserved.