Karaoke is one of those world phenoms that shows how picking up on a tiny detail can lead to great things. I'd read that a musician who owned a music store noticed customers humming along with pop songs played in his shop. Seems recorded musics for pro singers to front was already a thing in Japan, but the machine and adding the lyrics (Mitch Miller style) made it available for everyfolk.
Happy all had fun and you have both a roady/grip & the spark of the party as a son-in-law.
Could get better, but not by much. R.