Joe:

To clarify a bit, there is a rather large Indonesian-rooted community in Cape Town who are called Cape Malay and Cape Muslim(though neither is strictly accurate) who have a musical performance tradition called Nederlandslied(also not strictly accurate), It consists of groups called "Sporting Clubs" which are choruses accompanied by multiple guitars, mandolins, and banjos--they sound like this

This would likely be Miriam Makeba's source. However, not withstanding the comment above, I think it is also still sung in Indonesia, my evidence being that I think I heard it on an album of Keroncong music once, and I am pretty sure it is coming out of a radio at some point in "The Year of Living Dangerously";-)

Here is some information, clipped from the "Cape Malay" entry on Wikipedia:

The Cape Malay community is an ethnic group or community in South Africa. It derives its name from the formerProvince of the Cape of Good Hope of South Africa and the people originally from Maritime Southeast Asia, mostlyJavanese from modern-day Indonesia (largely speakers of Malayu, hence the name Malay), a Dutch colony for several centuries, and Dutch Malacca,[1] which the Dutch held from 1641 – 1824.The community's earliest members were enslaved Javanese transported by the Dutch East India Company. They were followed by slaves from various other Southeast Asian regions, and political dissidents and Muslim religious leaders who opposed the Dutch presence in what is now Indonesia and were sent into exile. Malays also have significant South Asian (Indian) slave ancestry.[4] Starting in 1654, these resistors were imprisoned or exiled in South Africa by the Dutch East India Company, which founded and used what is now Cape Town as a resupply station for ships travelling between Europe and Asia. They were the group that first introduced Islam to South Africa.

People in the Cape Malay community generally speak mostly Afrikaans but also English, or local dialects of the two. They no longer speak the Malay languages and other languages which their ancestors used, although various Malay words and phrases are still employed in daily usage.

This cultural group developed a characteristic 'Cape Malay' music. An interesting secular folk song type, of Dutch origin, is termed the nederlandslied. The language and musical style of this genre reflects the history of South African slavery; it is often described and perceived as 'sad' and 'emotional' in content and context. The nederlandslied shows the influence of the Arabesque (ornamented) style of singing.