Which jazz trombonist also used conch shells to create what was known as "open source" improvised music?

Who was a black militant?

A. Stokely Carmichael B. Sam Prater C. Martin Luther King, Jr. D. James Brown

What did Medieval musicians identify through the use of the Guidonian hand?

a. transpositions b. mode c. how to sing polyphony d. notes and hexachords