On what was the new vocal style of opera modeled, and how did various historical influences converge to shape its distinctive characteristics? Was it primarily inspired by the rich traditions of ancient Greek drama, or could one argue that the grounding came from the complex harmonies of the Renaissance polyphony? Furthermore, how did the socio-political landscape of the time contribute to the evolution of operatic techniques, leading to the emergence of this innovative style? Were there pivotal composers who significantly impacted this transformation, perhaps weaving elements of folk music or contemporary themes into their compositions? Moreover, could the dramatic narratives portrayed within these operas reflect deeper cultural shifts, resonating with audiences on a level that transcended mere entertainment? In doing so, did they not only reinvent the art form but also challenge the very essence of vocal expression as it had been known? Lastly, how did the interplay between theatrical performance and musical virtuosity facilitate this metamorphosis, creating a new paradigm that continues to influence opera today? What enduring legacies from this period can still be discerned in modern operatic practices? How have these historical models informed contemporary interpretations of vocal techniques within the genre?