Best Opera Singers of the '90s USA Today ranks the top 10 opera singers of the 1990s. http://www.usatoday.com/life/opera.htm
Opera Singers of Yesteryear Biographies and sound clips of many early 20th century operatic performers. http://bassocantante.com/opera/singers.html
Twentieth Century Opera A brief analysis of opera in the 20th century. http://www.infoplease.com/ce6/ent/A0860142.html
Who Was Who in the D'Oyly Carte Opera Company A directory, photo gallery, and biographical resourse devoted to those who performed with the company between 1875 and 1982. http://diamond.boisestate.edu/gas/whowaswho/
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