Is there a way to rebuild an iTunes library? I'm trying to clean up things (delete files/playlists I don't need etc.) but find that I have lots of files inside the ~/Music/iTunes/iTunes Media/ folder which doesn't show up in iTunes itself (mostly PDF files ("books") and Podcasts). I was hoping there's a way to make iTunes rescan its iTunes Media folder and update its library. I've searched the web for info, but could only find ways to re-import earlier libraries. Other suggestions have been to delete the iTunes Library.itl and iTunes Library.xml files which will supposedly be rebuilt once you start iTunes again, but this only results in iTunes complaining that a library isn't found. I'm using iTunes 18.104.22.168. on OSX 10.9.5.