Ke$ha unleashed the beast this week on her new Dr. Luke-produced party anthem “Die Young,” which takes us back to the fun “Tik Tok” days. She may have reclaimed her throne as pop’s brattiest party queen, but I’m hoping the rest of her third album Warrior will show us some growth from the singer/rapper. P!nk has reason to celebrate. Her excellent new album “The Truth About Love” has given P!nk her first #1 album on...