Zimbabweanmusic includes folk and pop styles. Much of it is based on the mbira[?], a traditional instrument from the Zezuru[?]Shona[?]. It has 22-28 metal keys on a soundboard, usually placed in a large gourd resonator.
... were at the far end of the Metropolitan Line, and stretch the definition of "tube station" a little:
Waddesdon tube station[?]
Quainton Road tube ...