Billboad just posted an article about Katy's Prism era(which was totally Unnecessary).   "In a half-century, I'm unlikely to plop my grandchild on my knee and say in an old-timey voice, "I remember when Katy Perry's Prism was the talk of the town!" Prism is not an epochal pop release, especially when one remembers the claims of cultural appropriation, the hammy "Birthday" video and the regretful RiFF RaFF remix that were included in its promotional cycle. But that's the point: even a flawed K