Hi @Wheaten,
transparent background isn’t possible. It is an initialised pygame screen, this screen can’t be transparent. It always needs a picture or color, alpha channel is ignored.
For the fade in effect I use a trick. I capture the current screen before the screen saver start and use it as background. But with your overlay the current screen is dynamically, with the next song it is changed. Therefore it’s not possible to use it as background.