Relates a musical manifestation to a musical item (this album, and my particular cd). By using this property, there is no assumption on wether the full content is available on the linked item. To be explicit about this, you can use a sub-property, such as mo:item (the full manifestation is available on that item) or mo:preview (only a part of the manifestation is available on that item). This is a subproperty of frbr:examplar.