Karaoke is an “audience participation” sound system, in which the soundtrack and usually the melody are played along with a moving display of the lyrics. Within this, there can be variations or different features.
The lyrics can be shown all at once, while the music plays in sequence.
The lyrics can be highlighted in synchronization with the melody line.
The melody line maybe will always play or can be switched off.
Some players will also include a vocalist singing the song.
Some players with vocals will turn off the vocals when someone is singing.
Some players will give a graphical display ...