I love  Karaoke because its used by recording engineers to refer to an instrumental version of a recording
I see, I've enjoyed singing karaoke myself
yea and in 1961, NBC carried a karaoke like series called sing along with Mitch where lyrics were superimposed on the screen for home audience participation
Wow, i didn't know it went back that far
yea but the different between sing alone and karaoke is the absence of the lead vocalist 
I see, are there any other differences?
well sing-alongs fundamentally changed with the intoduction of new techonology 
Ah, that makes sense