In a bash script/command how can I make a PC beep noise, or play a sound file?

I have some long running scripts with breaks requiring input/interaction to continue but when I switch to another window I’d like to be notified (by sound) that a task is complete and now awaiting input.

I would prefer to be able to play an audio clip (*.mp3, *.ogg, etc.) but wouldn’t care if the only solution is to make the PC Speaker beep noise.

Any ideas? I’m open to any CLI utilities I can install that play sounds that in turn I can execute when needed.

FYI: My System is running WinXP Pro.

UPDATE: Doh! My Windows > Control Panel > Sounds > Default Beep: was set to (none). Grrr…

Problem solved.

In a bash script/command how can I make a PC beep noise, or play a sound file?