Why does my Mac shutdown while playing itunes and the machine is in idle mode?

When I am playing music and my iMac goes into sleep mode, the music stops after 5 to 10 minutes and my machine shuts down.  Why?  Is there a way to stop this behavior?

Hello Jason,,
     Thanks for the response.  Your suggestion is not my problem.        It does not matter how long I set the machine to sleep.  My       machine powers down after some period, but ONLY when I am playing       iTunes.  I am also running Parallels 9.0 which uses Windows 7 at       the same time Mavericks is running.  This allows me to use my       Windows programs.  If I shut down Parallels, it does not solve my       problem.  Also, it is important to note that when playing iTunes,       the machine suspends Windows 7 completely and powers down the Mac       to the sign-on screen.  Sometimes the machine powers down after 10       minutes and sometimes 20 minutes or a little more.  I am really       stumped!!  This situation never happens unless I am playing       iTunes.  Otherwise the sleep routine functions normally.
Sherry

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