I love karaoke, its my favorite hobby, the primary difference between Karaoke and sing-along songs is the absence of the lead vocalist
I've never tried Karaoke. Is it fun?
Yes its really great! You can also try a game on PlayStation 3, Nintendo GameCube, Wii, Xbox, and Xbox 360 called Karaoke Revolution 
I don't own any of those, but isn't half the fun of karaoke embarrassing your self in public?
Yes thats the thing about it :D you have to drink a bit before! also karaoke can refer to an instrumental version of a recording
Oh, it can?
List of Karaoke Revolution songs
Song lists – North America.
"Note: These songlists include the names of the artists who most famously recorded the song. The songs as they appear in the game are covers, with the exceptions being the song "Dance Like There's No Tomorrow", which is the master recording of the Paula Abdul song, and 10 original Mowtown songs in the Xbox version of Karaoke Revolution"
Song lists – North America "Karaoke Revolution" (NTSC).
"Note: Italics denotes a
Karaoke Revolution
Karaoke Revolution and its many sequels are video games for the PlayStation 2, PlayStation 3, GameCube, Wii, Xbox, and Xbox 360, developed by Harmonix and Blitz Games and published by Konami in its Bemani line of music games. The Original Concept for Karaoke Revolution was created by Scott Hawkins and Sneaky Rabbit Studios. Technology and concepts from the game were subsequently incorporated into Harmonix's game "Rock Band".
The Japanese versions of the game are developed by Konami themselves. The gameplay also differs significantly