Write a brief essay discussing the life and contributions of Thomas A. Dorsey on modern gospel music

What will be an ideal response?

Thomas A. Dorsey (1899-1993)
was most responsible for the initial propagation of modern gospel music
early career as a blues singer, composer, pianist
1921—first drawn to gospel
1932—wrote "Precious Lord" (gives up performing blues)
published his own compositions, not in books: sheet music
promoter, organizer, and manager
started with singer Sallie Martin the National Convention of Gospel Choirs and Choruses
also performed and toured with Mahalia Jackson
promoted the solo gospel singer