A thought for those who might try a curtain over the screen, have a Roman shade made the width and height of the screen. If there's a substantial space from the top of the screen to the ceiling, have matching panels that stay stationary and hide the hardware that lifts the curtain vertically.
If you go the distance, get a remote control for lift and fall....
Home theater like the big ones....supply your own fanfare..... ;)
To keep it in scale, no lion....a cat's long meow, or kittens...*L*
If it 'has to be' instrumental, a kazoo....😏