[canop]

You were right : "This is a design feature of a detection circuit and system BIOSes developed by Award/Unicore from 1997 on."

[savramescu]

So Microsoft actually suppressed this on Normal Mode, but not in Safe Mode. At least there's information about it somewhere, because I wouldn't expect it if I encountered it.

[_ea1k]

"During normal operation or in Safe mode, your computer may play "Fur Elise" or "It's a Small, Small World" seemingly at random. "