The Harlem String Quartet, an all-Black and Latino ensemble founded in 2006, has a unique and challenging mission: to advance diversity in classical music with varied repertoire, highlighting works by minority composers, while engaging young and new audiences. (You may have seen the group during the Christmas holiday performing on NBC's "Today Show.") Pro Musica Joplin will present the Harlem Quartet on Thursday Jan.28 at 7:00pm at St.Peter's Catholic Church, 812 S. Pearl in Joplin. It's free and open to the public; donations will be appreciated. The Harlem Quartet will also perform on Friday Jan.29 at 9:30pm at the Kitchen Pass Restaurant, 1212 N. Main in Joplin; there will be a small cover charge that evening. Their program will include string quartets by Haydn and Schumann, as well as music by Wynton Marsalis and a string quartet arrangement of Ellington & Strayhorn's "Take the 'A' Train." For more information on the group visit www.harlemquartet.com. And for more information on their Joplin concerts, call Pro Musica at (417) 625-1822 or visit www.promusicajoplin.org.