I love Karaoke singing!  The difference between Karaoke and sing-along songs is that there is no lead vocalist in Karaoke
I love it too! It's fun!
Interestingly, many amateur and professional music artists use Karaoke recordings!
Do you know any professional Karaoke singers?
No, unfortunately I don't - but there used to be a tv show called Sing Along with Mitch that was a karaoke-like series!  I'm old enough to remember it!