contract

from here:

A Group Contract can address issues such as who owns the group name (and whether and in what capacity a leaving member can use the group name), who owns what property (including not only sound equipment but intangible property such as recording agreements and intellectual property such as the songs and the recordings created by the group), and how profits and losses are divided. Since it almost goes without saying that members of a band inevitably leave and groups inevitably disband, it is important to structure an interband agreement in the early stages of a career. It will function like a prenuptial agreement when matters start to disintegrate and make the break-up process less painful.