Answer:
I am a rock group with four members. All dead one was assassinated.
You do not want me when you donβt have me but when you have me you don't want to lose me.
I am the reaction after enjoying soda.
I have memories but none of my own whatever's on my inside is what is shown. If I'm ever different it's because you changed me I feel like a decoration here for you to arrange me.
A move made popular by the King of Pop.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.