I made basic startup/shutdown sounds for ReactOS in classic win95/98/2000 style. I think they are pretty good match system ideology.
Work is currently in progress and will be updated soon. I will add more sounds for other system events and release uncomressed version when i complete.
Let me know what do you think.
List of future sounds:
Forum Post: https://www.reactos.org/forum/viewtopic.php?f=25&t=16184
YouTube preview: https://www.youtube.com/watch?v=sGawqACInnQ