Of course, just because your name is Bach and you happen to be a musician doesn't guarantee your ability to write memorable music--or even music worthy of any special attention. That's proven by the two rather square, harmonically predictable, rhythmically staid sonatas "for five instruments" by Heinrich Bach (1615-92), the formulaic "battle" piece by Cyriacus Wilche (d. 1667)--Anna Magdalena's grandfather and thus quite a stretch for inclusion here, and an interminable if inoffensive theme and 15 variations for harpsichord by Johann Christoph (1642-1703). Nevertheless, this is music well worth investigation by anyone who wants to explore a little more deeply the roots of the Bach family tree. The first-rate performances are accompanied by sound that's on the dry side, giving extra bite and a slight rawness to the timbres that works very well for this unusual if not essential repertoire.