ShowbizLadysmith Black MambazoMetro11 April 2012GIGLadysmith Black MambazoPaul Simon's South African pals return with their gently uplifting a cappella Tonight, Barbican, Silk Street EC2, 7pm, £20 to £27.50 (limited availability).Tel: 0845 120 7550. www.barbican.org.uk Tube: Barbican/MoorgateMORE ABOUTFolk RockPaul SimonSouth AfricaSouthern Africa