I've always wondered about this since it's the start of decay of wood. I understand they get it before it starts to get soft. Does it retain resonance as a tone wood? It looks cool but I've always wondered about the tonal qualities.
http://www.wood-database.com/lumber-identification/hardwoods/spalted-maple/
http://www.wood-database.com/lumber-identification/hardwoods/spalted-maple/