Thirteen years into its prime-time run, “American Idol” is a brand in decline. But the kinds of things the show can do–and, in some cases, is doing–to change its fortunes can serve as an example to other businesses, as well. So, what can businesses learn from “American Idol’s” downward slide? Experts say lessons include: Stay distinctive; listen to your critics; and constantly reassess your brand. Branding expert Karen Post says “Most brands get stale over time, especially if your audience is impacted by trends, fashion and pop culture. American Idol’ is feeling like a light blue leisure suit instead of an ‘it’ persona in the latest runway look. Brands need to stay relevant.”