Today we take a suggestion from listener Dave, and dive into the wonderfully rich "Trauerode", which was written for the funeral of a princess. Bach put some extra effort into the instrumentation and orchestration.  Here we have an aria with not just one complex obligatto instrument line, but three separate obligatto instrument lines (flute, oboe, violas da gamba), all with different material and different timbres.

"Laß, Fürstin, laß noch einen Strahl" (Trauerode) (BWV 198) -- tenor aria

Link to information about upcoming concert at Alex's church in Orange, CA: Sunday Oct 1 at 4pm, Bach cantata #147