Final answer:
Wagner's conception of opera as music drama fused music, text, and visual elements in a 'total artwork' known as Gesamtkunstwerk.
Explanation:
Wagner's conception of opera is known as music drama. Wagner introduced the concept of Gesamtkunstwerk or a 'total artwork', where music, text, and visual aspects were fused together in his works like the four-opera cycle Der Ring des Nibelungen. His innovative approach influenced modern composers and his works marked a significant shift in the operatic genre.
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