[In case you want to confirm that this is not a hoax:
http://support.microsoft.com/support/kb/articles/Q261/1/86.ASP]

   Computer Randomly Plays Classical Music

   The information in this article applies to:

       Microsoft Windows 95
       Microsoft Windows 98
       Microsoft Windows 98 Second Edition
       Microsoft Windows 2000 Professional
       Microsoft Windows 2000 Server
       Microsoft Windows NT Server version 4.0

   SUMMARY

   During normal operation or in Safe mode, your computer may play "Fur
   Elise" or "It's a Small, Small World" seemingly at random.  This is
   an indication sent to the PC speaker from the computer's BIOS that
   the CPU fan is failing or has failed, or that the power supply voltages
   have drifted out of tolerance.  This is a design feature of a detection
   circuit and system BIOSes developed by Award/Unicore from 1997 on.

   Although these symptoms may appear to be virus-like, they are the
   result of an electronic hardware monitoring component of the motherboard
   and BIOS.  You may want to have your computer checked or serviced.

   Additional query words: beethoven

   Keywords: kbhw win95 win98 win98se
   Version: WINDOWS:2000; Win2000:95; winnt:4.0
   Platform: WINDOWS winnt Win2000
   Issue type: kbinfo

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