I'm surprised there is no 'top 40' playlist, or 'top streamed' songs playlist... Under the 'new' section I have found a top songs list, but you can't save it as a playlist. I'm a spotify user and that's pretty much all I listened to - a playlist that's updated every week with the top 40 songs. Theres a few 3rd party users on spotify that have created top 40 playlists, updating them every week, but it doesn't seem like you can even search for other users playlists on apple music? Only apple's own curated lists? Hopefully this will change soon!