JBO Kantorei Sankt Barbara YMCA Auditorium December 27 In celebration of the Polish Year in Israel, Krakow's Kantorei Sankt Barbara chamber choir appeared here for a guest performance with the Jerusalem Baroque Orchestra, conducted by David Shemer. It was a welcome opportunity to make a first acquaintance with little-known Polish Baroque music that had not been played in this country before. The elegant and lighthearted Adam Jarzebski's orchestral Sentinella and Canzon Seconda, despite noticeable Italian influences, nevertheless sounded somewhat different form the often more heavy Baroque works from the rest of Europe. Grzegorz Gorczicki's Completorium conveyed the spirit of worshipping God with joy - and that's how it was performed by the choir. The four soloists sounded best when they were singing together, blending in harmoniously with each other. Although not Polish, Bach's Mass in G minor was the concert's conclusion. The choir sounded fairly well-rehearsed and firmly consolidated.