bal·a·fon or
bal·a·phone 
(bäl
ə-f
ōn
′)
n. A large, usually pentatonic xylophone of West African origin, consisting of resonating gourds of graduated sizes under wooden bars which are struck with mallets.
[French balafon, from Maninka bala fɔ, to play the balafon (from bala, balafon + fɔ, to say, speak, play an instrument) or from a kindred source in another Mande language.]