When we hear that Pharrell Williams co-wrote 43 percent of the songs played on the radio in 2004, or that Dr. Luke wrote virtually every hit song in 2014, we’re barely even surprised. If anything, we’re just glad that every credits box doesn’t say “LyricsBot2000” yet. And besides, it makes no difference who wrote the song as long as it’s good, right? Actually, in some cases, it makes all the difference. Here are seven famous songs that take on a whole new meaning when you find out who wrote them — with implications that range from the fascinating to the terrifying.