By Michael Tedder Retail giant once held sway over media landscape, but that was before a key change. Walmart used to be one the main players in the entertainment industry. And the people who made that entertainment were generally not happy about that, but felt like they had no choice but to play along. In the 1990s, Walmart (WMT) – Get Walmart Inc. Report wasn’t just one of the most popular retailers in America, it was also one of the biggest sellers of CDs. But Walmart had policy that they would only carry “family friendly” material, and had what some artists called a heavy, censorious hand….