Very difficult to answer. Well, the Kara i like is the 5 member one, not the 4.Still, I think they shouldn't forget the past so that they will know how much they have gone through to be the Kara we recognize now.So, my answer is Yes they should sing the songs on their 1st album, but sing it with equal proportions for each member rather than focusing more on Gyuri, Seung Yeon and Nicole. After all, each and everyone of them is a part of Kara.