During their Revolution (1974–91) the Ethiopian penchant for not throwing anything away was, out of necessity, given full rein; ammunition boxes were converted to book satchels, artillery shells were made into pots and pans, and so on.
In one instance, a traditional three-piece gong ensemble associated with the Ethiopian Orthodox Christian Church was made from components of an abandoned Soviet-made tank; some 600 of these tanks were used in Ethiopia during the 1970s and 1980s. Struck by an acolyte using a small stone, the gongs mark the beginnings of services and other notable events.
This according to “Make army tanks for war into church bells for peace: Observations on musical change and other adaptations in Ethiopia during the 1990s” by Cynthia Tse Kimberlin, an essay included in Turn up the volume! A celebration of African music (Los Angeles: Fowler Museum of Cultural History, 1999, pp. 124–131).
Above, the bells in question; below, a comparable set of Ethiopian stone chimes (please turn your screen or head sideways).