Design a bold retro halftone music festival poster artwork built from abstract instruments, radiating sound waves and dancing geometric silhouettes, with no readable event text. Interlock a stylized trumpet, drum, guitar neck and speaker shapes into one dynamic central collage. Use a layered screen-printed paper field with torn edges, imperfect ink registration and energetic diagonal rhythm. Compose a vertical 3:4 poster with a strong central hierarchy, an empty top band and a lower strip reserved for later typography. Blend coarse halftone dots, risograph texture, ink bleed and visible paper fibers. Use tomato red, cobalt blue, sunflower yellow, black and warm paper cream. No letters, no numbers, no logos, no trademarked symbols, no fake text, no watermark, no smooth gradients that erase the print texture.