OK, this is not actually Microsoft Dynamics GP related, but it is great for a bit of harmless (and in my case ... tuneless) fun.
Songsmith is a bit like Karaoke in reverse. You sing the lyrics into a microphone and the software automatically generates the backing music in whatever style you want.
If you want to know more or want to have a play with the free trial version, go to the web site below:
PS: Sadly, it could not help me to sing in tune.