Illustrate a charismatic rockabilly quokka, sporting a slick, retro-inspired hairstyle with a vibrant tuft of hair combed back. The quokka exudes a cool, laid-back attitude, dressed in a stylish leather jacket adorned with intricate embroidery of music notes and guitars. Its round, expressive eyes gleam with a mischievous twinkle, reflecting the playful spirit of this rockstar marsupial. A sleek, electric guitar slung over its shoulder adds a touch of rebellious flair, while its tiny paws seem ready to strum the strings with rock 'n' roll energy. In the background, a vintage jukebox plays classic rock tunes, setting the stage for a lively performance by the groovy quokka.