How can I turn off a Mac's display without sleeping the Mac itself? Possible Duplicate:
  Is it possible to put the display to sleep without putting the whole computer to sleep?  




I have an iMac, and sometimes I want to play some music over night, without the bright display. The display will be turned off automatically several minutes later, but I would like a button that turns the display off instantly and keeps the music playing.

How can I do this?
Ctrl+Shift+Eject will turn off the displays but leave the computer active.

Control ⌃+Shift ⇧+Power ⌽ for some Macbook