[To read an introduction to The Great Voices Project, click here.] [To read previous portions of the list, click on these links: #50-#46 … #45-#41 … #40-#36 … #35-#31 … #30-#26 … #25-#21 … #20-#16 … #15-#11.] ——————————– #10: Mahalia Jackson Staying mostly in the Gospel genre, Mahalia Jackson recorded over 30 albums in her career, which spanned over four decades. Considered by many as the greatest Gospel singer of all time, Jackson got up and sang at a worship service in Chicago unasked. The next week, she was in the choir, and within two years was singing professionally. Mahalia Jackson is one of the few Gospel singers to gain…