Katy Perry looked yummy on “Saturday Night Live”–if you can get over the cannibalism connotations of her new song “Bon Appetit.” She’s moved away from power pop and served up a lilting Reggae-rap inflected dance music Perry also sang “Swish Swish,” described as a house-inspired song that samples “Star 69” by Fatboy Slim that some say disses Taylor Swift. ...