In my opinion this performance is successful because the singers use their voices to create the beat and melody basically they performe the whole song using only their voices. Another successful thing this live performance has is that it sounds exactly the same as the original. Their harmonies are perfect and they all know what part they should sing and when to harmonise. Also their stage presentation they move all the time and the person who has to sing their part is in the middle and when they all sing together they are spread out this shows that they have a lot of experience with performing. The fact that they don’t make any mistakes shows that they practice a lot this shows success because they learn how to train their voices and how to use them. Another reason why this performance is successful is that they don’t sing over each other , they all know how loud or quiet they should keep their voice. Also they can reach any low or high notes without any problem this shows success because they have the ability to sing at different ranges. Overall this performance is successful because they are all in timing, they know their parts and they sound exactly the same as in their original video.