Wagner's idea that an opera that has continuous music throughout with a primary goal of symbolizing the drama was called music drama. He also broke the record for opera length with his piece Der Ring des Nibelungen -- it took four nights to perform, with a total of about 15 hours,
Basically he made it so when you watch opera the lights get dimmed and you have to be quiet.
Wagner created "music drama," which meant to combine all of the arts into one unified operatic form. He also changed the concert experience by dimming the lights in the audience for the first time.
Many female opera singers have achieved international fame over many years of operatic history. Your question is too broad for a single answer.
An aria is an extended operatic solo.
HOW DID SELENA CONTRIBUTE TO HISTORY?
German.
Geography, Religion and People all contribute to or influence history.
Eaton Operatic Society ended in 1965.
Purcell Operatic Society ended in 1902.
Purcell Operatic Society was created in 1899.
Belfast Operatic Company was created in 1960.
Eaton Operatic Society was created in 1919.