Sometimes I like to karaoke. That is singing to an instrumental version of a recording with no vocals.
wow..what is karaoke?
It is singing to recordings that lack vocals. The words are provided. It is frequently done in nightclubs.
ok, i see some musicians do that on stage, do you sing?
Yes, artists do it when the whole band can't travel for a performance. I only sing as an amateur. I do it for fun.
really, who started karaoke? 
It first started in the 1960s and 1970s when stored audible materials could be played in clubs.
ok, that was a long time ago,
Yes, the difference between karaoke and sing-along is the absence of the lead vocalist.