As requested, the BBC Music mags list :
1 Callas
2 Sutherland
3 De Los Angeles
4 Price ( Leontyne )
5 Nilsson
6 Caballe
7 Popp
8 Price ( Margaret )
9 Flagstad
10 Kirkby
11 Schwarzkopf
12 Crespin
13 Vishnevskaya
14 Janowitz
15 Mattila
16 Schumann
17 Brewer
18 Tebaldi
19 Ponselle
20 Ameling
I wouldn't dispute any of those (and nice to see Christine Brewer making an appearance!), but the appeal of Gundula Janowitz continues to elude me. She had a very frail, white-faced tone, which went very wobbly under the slightest pressure; and there is a strange vocal resemblance to Aled Jones! Not my cup of tea, I'm afraid.