Why does playback stop when my screen goes to sleep?

Hi guys,
I have a mid-2010 MBP with MAC OS X 10.7.3 and itunes10.5.3 (3).
I've started to get this strange issue. When monitor goes to sleep, itunes playback stops.
I tray to change enervy saver option and I did this,
- computer sleep after 3h
- monitor sleep after one minute.
- itunes plays music
After one minute, monitor goes to sleep and so does itunes, why this is happening to me ?!?!?
This thing makes me crasy, since with other program playback (see VLC) I don't get this.
Please somebody help me in undestanding and solving this!!!
Thanks
Riccardo

The problem is that in lion "monitor sleep" means HDMI sleep too. So when you're listening to music with HDMI when your monitor goes to sleep, so it does your HDMI and audio through it!!
That's really non sense

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