Rajab Suleiman & Kithara play taarab music, a popular style from the islands of Zanzibar. The song is "Chungu", the singer young up-and-coming star Saada Nassor. More information on Kithara at: http://www.jahazi-media.com/kithara.html .
A CD of Kithara's songs is available in the Zanzibara Series on Buda Musique: Rajab Suleiman & Kithara - Chungu = Zanzibara 8. Cf. http://www.budamusique.com .