geoff: npr media correspondent, david folkenflik. thank you for your time. . ♪ amna: like a number of institutions, classical music has been under recent pressure to diversify its ranks. but one group in detroit has been at it for a long time, and its reach now stretches across the nation. jeffrey brown reports on the sphinx organization for our arts and culture series, canvas. ♪ jeffrey: an after-school violin class at the cesar chavez academy, a public charter school in detroit. >> 1, 2, ready. go. jeffrey: among the songs, the traditional folk tune "de col ores." among the students, nine-year-old taniel hernadez who loves to play at home for his mother while she is cooking. >> i also play de colores to her since that is my favorite. jeffrey: it's your favorite, why is that? >> because it is a lile bit challenging, but i still can do it. jeffrey: that he can do it,th oe thvi as llthe an inplay he has at home, is vital for his mother, elizabeth cruz, who struggled to find and pay for music lessons for her son. >> they need that more here in soutest. because