Record producer and Lady Gaga's long-time collaborator DJ White Shadow says the singer's next album will be ARTPOP's "little sister." The Detroit-based DJ compared the upcoming record to Gaga's controversial 2013 album, which celebrates its fourth anniversary today, in an emotional new Instagram post. "4 years ago I put out a record called ARTPOP with Lady Gaga," the DJ, real name Paul Blair, told his followers. "I could write a book about it, maybe one day I will. I lost a best friend and