NAIROBI, April 9 — For centuries, Somalis used poetry and songs to pass protest messages to powerful rulers they were too afraid to confront directly. Now, some young Somalis are using rap to speak out against Islamists who they say are using religion to wage war in their country. The 11-member Waayaha Cusub band, currently in exile in neighbouring Kenya, wants its rap lyrics to encourage fellow Somalis to stand up to Islamist rebels known as al Shabaab. They have handed out at least 7,000 free copies of their newly-released album titled “No To Al Shabaab” to residents in Nairobi’s...