The public domain continues to roar back after decades in a coma.The Duke Center for the Public Domain’s collage of artwork from movies, music and books that entered the public domain on Jan 1.On January 1, 2019 something extraordinary happened. For the first time since 1998, the American public domain got bigger. What happened in 1998? Congress — led by Rep Sonny Bono — extended the copyright on all works by 20 years. Works that had already been in the public domain went back…