fm.freemix.group.stems

A stems group: a structural grouping of stems that is downloadable/sellable as a unit, independent of any release (FM-549 s38). First record under the net-new group.* segment (named group.stems, not group.stemsGroup — the segment already says 'group') (for sets that fit neither collection.* — the curatorial lens — nor release — the put-out work). Points DOWN at its member stems; the sold-product name lives here. RELATIONSHIP TO fm.freemix.release: a release is a separate 'put-out work' wrapper that MAY include this record as one of its members; this record is the structural group itself, not the release.