Legendary musician Dick Knight played trumpet, sax and organ; sang standards like ‘Autumn Leaves’ and the blues classic ‘The Thrill is Gone’; invoked the names — and often the sound — of famous African American musicians from Marvin Gay to Louis Armstrong; and entertained the students of Southeast Elementary School on Tuesday in a Black History Month event that was nothing if not unique. Knight took up the trumpet at age 10, played with James Brown in the mid-1960s and is still performing professionally at age 75.