Bauer Media would be the best publisher for the author's music magazine. Bauer already publishes similar magazines like Kerrang that target the same audience as the author's magazine. Publishing with Bauer could reinforce and maintain their current audience without broadening to new genres. While Immediate Media and Prometheus Global publish some magazines, their existing titles do not target the same audience as the author's magazine. Bauer is the best fit because they already have an established, similar audience.