I saw my sister doing this and at first I thought iy was stupid. But when I tried to do it I found out I kicked as at it. It's very entertaining and funny. You only have to go to www.karaokeparty.com and register. You select song you wanna sing or battle against people online. You only need a headset. Here is how it looks like:

don't worry if you think you can't sing, nobody on this site can
and don't hate it until you try it, add me my name is teenageblackguy we can battle and shit

Do I really need a headset and microphones for this?

Trust me, the game StarMaker on iPad is better, improves your pitch and voice and all...