There are 9 community property states in the United States in which upon death or divorce of a spouse to a marriage, property acquired during marriage is split 50/50. If you wish to change the nature...
Typically there would be a written agreement between the artist and the entity to which they are surrendering their rights. See the article linked below for an example.
Inherited property is not generally considered community property. However, if the property is located in another state, the property laws in that state govern.