Answer to Question 1
The kora is classified as a chordophone because strings vibrate to create the instrument's sound.
The kora is a 21-stringed harp-like instrument with the strings pulled over a bridge (a piece of notched wood similar to violin's bridge). The neck passes straight through a skin-covered resonator.
Answer to Question 2
Three musicians create the music, a vocal solo accompanied by a kora (a twenty-one string bridge-harp) and percussion/spoken interjections. (See photo of a kora in Worlds of Music, Fig. 3.3, p. 1126)