…just as the topic says: I am searching for South-African music on Concertina&Whistle, preferred instrumental. I don’t mean the “Boerenmusiek”, but rather more vivid stuff. What can You recommend? Thx in advance!
Using the phrase “squash box” (or squashbox) might make searches more fruitful.
http://www.amazon.com/Squashbox-Sotho-Xhosa-Concertina-1930-1965/dp/B000AQEEBK
http://www.rootsworld.com/freereed/squashbox.html
Just to let You know: Finally made it to get the “Squashbox”-CD, even though it’s been oop for quite some time. Well - usually, I don’t really like fieldrecordings, and also, I haven’t been into African music (so far) - but this album is reeeeaaaly GREAT stuff! Strongly recommend it! 
Glad it helped.