Africa News Tonight: In Cameroon, hundreds of singers are using their voices to call for a cease-fire between the military and separatist forces in restive western regions. Sudan's powerful neighbor to the north is watching its conflict with deep concern, but Egypt seems unable to take a clear position. And, snake experts in South Africa say an energy crisis is partly to blame for a shortage of antivenom in sub-Saharan Africa that has left at least three people dead in the past three weeks. For this and more, stay tuned to Africa News Tonight!