Leonid & Friends continues to astound its global audience with its uncanny ability to capture the spirit, musicality, and fire of American supergroup Chicago. And what is even more stunning is that Leonid & Friends, comprised of 11 of the finest musicians in Russia, Ukraine, Moldova, and Belarus, haven’t seen Chicago perform live, yet replicates the band’s complex arrangements amazingly note for note. The band performs at Boarding House Park, 40 French St., Lowell, as part of the Lowell Summer Music Series. Tickets start at $36.