RSD - or Record Store Day for you vinyl virgins- comes but once, er, or twice a year, and while the main focus is who will win the privilege to buy a color-vinyl edition of the Wicked soundtrack, there's a little bit of jazz sprinkled in there, too.  The boys talk about four selections, three recently uncovered live dates on the prolific Resonance Records, and a studio date from German stalwart MPS.  Kenny Dorham  - BLUE BOSSA IN THE BRONX; Charles Mingus – IN ARGENTINA – THE BUENOS AIRES CONCERTS; Freddie Hubbard – ON FIRE: LIVE FROM THE BLUE MOROCCO; Nathan Davis – HAPPY GIRL.