Rajab Abdul Kahali (born 15 March, 1994), also known by his stage name Harmonize, is a Tanzanian Bongo Flava artist, singer, songwriter, and entrepreneur.

After completing secondary school education in 2009, Harmonize has lived in Dar es Salaam. He is also known as Konde Boy, referring to his Makonde heritage. Other aliases include Jeshi, Tembo, Mbunge, Konde-Mabeyo, and Bakhresa. He released his debut song, "Aiyola", in 2015. Other songs, include "Kwa Ngwaru"] featuring Diamond Platnumz, and "Show Me" featuring Rich Mavoko. In 2017, MTV Base (African TV channel) included him in their African edition of "Ones to Watch for 2017".[4] He was the first artist to sign a recording contract with the Diamond Platnumz WCB Wasafi label and has since founded his own record label, Konde Music Worldwide. Listen up, and enjoy it.