Reply To: Not quite Fun Stuff but . . .
youtube to mp3 converter so I can extract the audio track.
I then used Audacity to edit various audio with the music track.
Free Video Converter to convert the .FLV to .AVI
Windows Live Movie Maker to edit the video and combine the edited audio
All the tools I used were free. There may be other software that is easier to use, but these applications did the trick for me.