Cantata BWV 173a, "Durchlauchtster Leopold" (Most Serene Highness Leopold), a birthday cantata for Prince Leopold von Anhalt-Köthen [Serenada], was composed in Köthen between 1717 and 1722. It is scored for soprano & bass soloists; and orchestra of 2 transverse flutes, bassoon, 2 violins, viola, violone & continuo.
Cantata BWV 173 "Erhöhtes Fleisch und Blut" (Exalted flesh and blood), a solo cantata for Whit Monday [2nd Day of Pentecost], was composed in Leipzig in 1727 (or 1724). The music of this cantatas is based on BWV 173a's music (a virtual parody) and it is scored for soprano, alto, tenor & bass soloists; 4-part Chorus; and orchestra of 2 transverse flutes, 2 violins, viola & continuo.
The discography pages of both cantatas on the BCW have been revised and updated. See:
Cantata BWV 173a:
Complete Recordings (7): http://www.bach-cantatas.com/BWV173a.htm
Recordings of Individual Movements (1) http://www.bach-cantatas.com/BWV173a-2.htm
Cantata BWV 173:
Complete Recordings (14): http://www.bach-cantatas.com/BWV173.htm
Recordings of Individual Movements (1): http://www.bach-cantatas.com/BWV173-2.htm
The revised discographies include many listening/watching options to recordings directly from the discography pages, just below the recording details.
I also put at the BCW Home Page: http://www.bach-cantatas.com/
2 audios and 1 video of cantata bwv 173. A short description below the audio/video image is linked to the full details at the discography pages.
I believe these are the most comprehensive discography of these cantatas. If you are aware of a recording of BWV 173/173a missing from these pages, or want to correct/add details of a recording already presented on the BCW, please do not hesitate to inform me.
You can also read on the BCW the current discussion of the cantatas in the BCML (4th round): http://www.bach-cantatas.com/BWV173-D4.htm