Create a highly detailed sketch illustration of a cat passionately singing and striking a cool pose while playing the electric guitar. The illustration should be rendered in monochrome to give it a vintage look, evocative of the 1970s and 1980s rock era. The cat should be depicted in a dynamic, epic pose that captures the energy and intensity of a rock performance, with the electric guitar accurately depicted with all its details. The background should be removed to focus only on the cat and guitar, and the illustration should not be cropped, with the entire cat and guitar visible in the frame. Pay particular attention to the details of the cat and guitar, creating a high quality and epic image that could be used on a t-shirt or other merchandise. The final image should accurately capture the form and style of a highly detailed vintage black and white sketch illustration, with the full cat and guitar clearly visible in the frame, and the cat depicted as if it is singing a high note wit