Last May ACCES presented the decalogue of sustainability for concert venues. Ten recommendations that will help concert halls and other venues make a green transition to improve their energy efficiency and enhance their contribution to environmental conservation. But is it easy to comply with these recommendations? Is it economically viable for our spaces? Are all concert halls at the same point in this ecological transition? Do they have the same opportunities? These and other doubts will be addressed in this panel that we present in this edition of Bime 2023.