First off, no need to yell
Second: Hello and welcome to them forum.
Third: I'd rather suggest getting the actual basics done first (actors etc) before concerning oneself with music (which isn't actually that needed. Granted, in this story there are two bits where it is, but aside from that)
I saw Stephen Briggs crowd do it a few years back, can't remember the music though.
Enjoyable but its the way its acted and presented that comes across the most. They keep props and scenery to a minimum and excel at the characters (same people have played the witches in different plays and they really work well together).
I've also seen The Random Salad Company do a few Discworld productions and they use modern music in various situations and its always really well done.
Thanks for all that. And I wish I could see the Portsmouth production, but sadly, I can't. If there are any other shows going on, I'd be glad to know about them.