A jazz band from Leningrad is the first Soviet entry ever in the annual Sacramento Dixieland Jubilee on Memorial Day weekend, organizers announced. "We have proved again today that there is no cold war in jazz," said Bill Borcher, founder of the 14-year-old event. He said the Leningrad Dixieland Band, among the oldest jazz groups in the Soviet Union, has toured Scandinavia, Eastern Europe and various Western European cities. It is one of 15 foreign bands expected at the festival. About 80 U.S. bands also are expected for the weekend of May 22-25.