The Bach Around the Clock marathon celebrates Johann Sebastian Bach's 332nd birthday (March 31) with more than 29 hours of music and performances. The festival also marks its 20th anniversary with a wide variety of music from the baroque period to contemporary jazz and Latin rhythms. Performers include Ellis Marsalis, Delfeayo Marsalis, Helen Gillet, Slow Danger Brass Band, OperaCreole, John Rankin, Chip Wilson, New Orleans Trombone Choir, the Grinnell Singers from Grinnell College in Iowa, Trendafilka, an all-women choir singing music from Eastern Europe and the Caucasus region, and others. There are performances by Lula Elzy New Orleans Dance Theatre, Mardi Gras Indians and Micaela y Fiesta Flamenca. Various members of the Louisiana Philharmonic Orchestra and visiting classical pianists perform. Trinity Artist Series organizer and organist Albinas Prizgintas (pictured) leads a quartet playing original compositions, and there's a screening of The Heart of the Organ, a documentary about the annual festival. Free admission. The marathon starts at 7 p.m. Friday, March 23. Trinity Episcopal Church, 1329 Jackson Ave., (504) 670-2520; www.trinityartistseries.com.