Rajab Abdul Kahali is a Tanzanian musician, songwriter and dancer who goes by the stage name Harmonize. He was born in Mtwara, Tanzania. He records for music label WCB Wasafi Record, which is under Diamond Platnumz’s leadership. He is well known for his hit song “Bado”, featuring Diamond Platnumz. He featured Rich Mavoko on his song “Show Me”. He was included in MTV Base’s “Ones to Watch for 2017” in Africa.