I just looked it up in Carls guide. Searched on 'LUSTROUS ENTERTAINER LEGACY STATUE'
The guide explains all of the statues that come with Into The Future.
Apparently they are kept in the park near city hall in the future world. Or that is how it reads to me.
The Sim needs to be level 10 on the laser Rhythm Rhythm-a-Con. None of the sims who previously watched the sim gain skill count as part of the 10 sims who need to watch once they get to level 10. So once you hit level 10 skill in the instrument, 10 different sims who haven't watched the sim play before they got to level 10 must watch them play after they hit level 10.
