The issue of who is entitled to use the name of a recorded band is usually governed by the group leaving provisions in a modern full-form recording contract. In the absence of relevant documentary provision there or elsewhere the central issue is to whom the "goodwill" (the likelihood of customers returning to the same place) in the name belongs. In most cases that will be a partnership asset to be held on the terms of the relevant partnership (s) and in the absence of express provisions the partnership assetts may not be used without the agreement of all of the partners - but they may be sold in a winding up of a partnership. At least that's the situation under English law. Twenty guineas.