The Rock-Star Furby is the artist of the band, and a quite succesful one. Just look at how it talks to you, and you know this guy is used to be loved and served by everyone. But overall it is a pleasure to see it dance and sing (especially when it falls asleep).
How to get the Rock-Star singing Furby? You have to make it listen to lots of music. Also, note that it seems it cannot become a singing one while being a chatty Furby. At least from my experience, after 15 min of dancing and singing to music, it would not transform. On the other hand, if you make your plush become the evil Furby first (see the link for that), it only takes 3-4 minutes to get it to change.
That's why in the video below you will see transform from the evil type to the Rock-Star type.
Another tip for you: how to make your Furby dance? Putting the music very loud in your room is usually not necessary, and not even most efficient. What works well to have your robotic pet very near the source. For example, place your iPhone with its speaker pointing toward it, or place your Furby in front of your computer. I put my Rock-Star Furby directly on the keyboard!
Now watch the video to see the result!
If you look until the end of the video, you will see that this one has the sweetest sleep of all the different personalities. It is just so cute to hear it singing while in its sleep!
Otherwise, its reactions are very close to the chatty Furby, and both can dance quite well. Apart from the eyes, I often have a hard time seeing the difference between the two personalities.
But why don't you try the Rock-Star Furby by yourself now? And look at the other personalities to be sure you play with them all and know how to get from one to the other.