The Montana Museum of Art and Culture presents "Jam Session: America's Jazz Ambassadors Embrace the World," a showing of photographs, paintings and other artwork related to the history of American jazz, at four venues in Missoula: the Paxson and Meloy Galleries and the main lobby of the PAR/TV Building on the UM campus; the Maureen and Mike Mansfield Library; and the downtown First Interstate Bank. The exhibit runs through April 24. A lecture by Curtis Sandberg, exhibition curator at Meridian International Center, will be held on Wednesday, April 14, at 7 p.m. in the PAR/TV Building's Masquer Theatre. Admission to all venues is free. For hours and more information, visit www.umt.edu/montanamuseum, or call 243-2019.