The occasion also meant that we got a chance to hear what February's nasty old snow prevented -- an extensive concert suite from "Porgy and Bess." Most of the soloists who had been booked for the performances that had to be canceled back then were available for this gig, too. The dynamic Heritage Signature Chorale was available for this occasion (the winter concerts would have featured the Morgan State Choir). And, perhaps most importantly, BSO music director Marin Alsop was still able to be here for podium duty (she typically has a busy summer schedule elsewhere). She's a wonderful Gershwin conductor, as was her predecessor, Yuri Temirkanov -- this composer sure does well by the BSO.