FILE - This is an October 1973 file photo of Swiss 

FILE - This is an October 1973 file photo of  Swiss opera singer Lisa della Casa, center, as she performs  on stage at the Zurich Opera "Opernhaus Zuerich", Switzerland, . According to media reports on Tuesday, Dec. 11, 2012, Lisa della Casa died at the age of 93 at Muensterlingen at the Lake of Constance, Switzerland. (AP Photo/Keystone/file)  NO ARCHIVE
Associated Press
FILE - This is an October 1973 file photo of Swiss opera singer Lisa della Casa, center, as she performs on stage at the Zurich Opera "Opernhaus Zuerich", Switzerland, . According to media reports on Tuesday, Dec. 11, 2012, Lisa della Casa died at the age of 93 at Muensterlingen at the Lake of Constance, Switzerland. (AP Photo/Keystone/file) NO ARCHIVE
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