Music festival poster, vertical 3:4, retro 1970s 2D illustration with grain texture. A giant stylized sun with concentric stripes in orange, red, pink and yellow rising behind rolling wavy hills, a single electric guitar silhouette in the foreground, palm tree silhouettes on the sides. Warm sunset color palette, vintage halftone and paper grain texture, bold flat shapes, symmetrical composition with empty space at the top. One short headline "GROOVE" in large rounded retro groovy letters in cream white. Vintage screen-print poster style, clean and vibrant.Negative: people, faces, 3D, photo, brand logo, small text, extra words, misspelled text, blurry, watermark, low quality