iplayer irritatingly only has stuff on for 6 days after transmission. BBC 4 does repeat their material pretty regularly. It will say on this pages when it does:
Fascinating stuff on people like Youssou N'Dour (to pick one of many examples) who have gone back to Africa after western success and are now building Africa labels for African artists.
http://www.bbc.co.uk/programmes/b00s3vdm
(in fact it looks like it was already repeated on BBC 2 from that page but it will come up again).
Would also highly recommend:
http://www.bbc.co.uk/bbcfour/music/features/african-rock.sht...
Fascinating stuff on people like Youssou N'Dour (to pick one of many examples) who have gone back to Africa after western success and are now building Africa labels for African artists.