Also, you can set a power scheme to turn the monitor off after a certain amount of time has passed in the Power Options Menu, different schemes for different times (1 for sleep another for movie watching etc...). But if you do this, try not use Fn + F3, as it seems to then reset the current schemes settings to default.
As for the screen turning on, any movement and yes changing of songs on a playlist, pretty much whenever the computers see's that it is being "used", it will turn the screen on.
I have been touched by his noodly appendage.
"I think we can all look forward to the time when these three theories are given equal time in our science classrooms across the country, and eventually the world; One third time for Intelligent Design, one third time for Flying Spaghetti Monsterism, and one third time for logical conjecture based on overwhelming observable evidence."