___ (1792-1844) had been the first African American musician to win wide acclaim domestically and in England; the first to publish sheet music; first to develop a "school" of African American musicians; he gave the first formal band concerts; was the first to tour the nation widely; and had been the first to produce a concert featuring an integrated group of musicians including European American performers.
a. Louis Armstrong
b. William Grant Still
c. Scott Joplin
d. Francis Johnson