Envision a siren as a cosmic entity, her domain a celestial ocean where stars and galaxies form the backdrop of her performance. She sits poised on a floating asteroid, her voice harmonizing with the music of the spheres. The asteroid is a complex mesh of angular surfaces and glowing seams, reflecting the grand scope of her cosmic stage. Her figure is abstract, almost translucent, with starlight streaming through her luminescent being. Her gown billows, becoming one with cosmic winds, its hem a cascade of nebular mists. Her operatic song is visualized as undulating waves of light and color, radiating outward in concentric circles, propelling the viewer into a transcendent experience. This abstract representation captures the siren's allure and power, blending the divine and the cosmic in a symphony of visual and auditory abstraction.