"opera" - key terms from Wikipedia

american soap opera
beijing opera
chinese opera
comic opera
english national opera
genetic opera
ghost opera
grand opera
grand opera	house
italian opera
italian opera	composer
light opera
metal opera
metropolitan opera
metropolitan opera	house
metropolitan opera	radio
new york city opera
night at the opera
opera
opera	chorus
opera	comique
opera	composer
opera	house
opera	houses
opera	mini
opera	mobile
opera	seria
opera	singer
opera	software
opera	theatre
opera	windows
oyly carte opera	company
paris opera
peking opera
peking opera	school
phantom of the opera
rock opera
royal opera	house
san francisco opera
savoy opera
soap opera
soap opera	digest
soap opera	digest award
southern rock opera
space opera
state opera
super battle opera
sydney opera	house
threepenny opera
vienna state opera