Great explanation, Grain.
The custom lyrics would sound great with the music, maybe if I used Powerpoint and then captured it with voice-over, except that I do not have voice-over software.
So maybe it will be a .ppt instead of a video.
But PowerPoints (as I have sadly found out last time I tried to do a Presentation) round slide-changes to the nearest 0.1 seconds! So no fan-music.
EDIT: Ctrl-Tab it is.