Rajab Abdul Kahali (born 15 March 1994), popularly known by his stage name Harmonize, is a Tanzanian Bongo Flava artist and music entrepreneur born in Mtwara Region.c Many of Harmonize songs become very popular and trendy online with a great number of streaming and downloads on Boomplay.

Since 2009 after completing his secondary school education, Harmonize is living in Dar es Salaam. Sometimes, he is referred to as Konde Boy referring to his Makonde heritage. Other names he goes by are Jeshi, Tembo, Mbunge, and Konde-Mabeyo.

Harmonize's four year relationship, and then marriage in 2019 to Italian socialite and entrepreneur, Sarah Michelotti was widely publicised. In 2020, one year after the exchanging of vows, it was announced that the couple had separated due to irreconcilable differences. It was reported that the split was caused in part by infidelity on the side of Harmonize which led to him fathering his first child out of wedlock. Since then, Harmonize has been seen by the public to be embracing his new role as a father. Just months later he publicly announced the beginning of a new relationship with Tanzanian actress Frida Kajala Masanja. They broke up barely three months after they started dating.

He started his music career in 2011. In 2015, he met Diamond Platnumz and got signed at WCB Wasafi 2015. His first song "Aiyola" was commercially successful. He won three awards from WatsUp TV, AFRIMMA and AEA USA (in the US).

On February 25, 2019, he released 'Afro Bongo'. His first EP features Diamond Platnumz, Burna Boy, Mr Eazi and Yemi Alade. Afro Bongo has four tracks including his major hit "Kainama" which is a track number one from the EP. "Kainama's" music video surfaced with over 14 million views in twelve months.

He was the first artist to sign a recording contract with Diamond Platnumz WCB Wasafi label and has since founded his own record label company, Konde Music Worldwide.Harmonize left WCB Wasafi at the end of 2019 and released several projects including 'The Return Of Q Chillah'. Out Of WCB, Harmonize released four commercial singles including 'Hainistui' and 'Uno' which is featured on his debut studio album 'Afro East' released on 14 March 2020.

Harmonize dropped an 18-track album titled Afro East, which is the follow-up to his 2019's EP Afro Bongo. The album, which is the Tanzanian artist's debut Studio Album and first project since leaving Diamond Platnumz's record label, features Burna Boy, Lady Jay Dee, Phyno, Yemi Alade, Mr Eazi, Falz, Skales, Khaligraph Jones, Morgan Heritage, Dj Seven, Mr Blue, Prince Fahim and several others.

On 5 November 2021, Harmonize released his sophomore album titled High School. The tracklist was revealed on the artist's Instagram page while he was on his 2021 American tour. The album was his first LP since Afro East. The project was preceded by the previously released Amapiano hits "Sandakalawe and "Teacher". Also, the first song on the album titled "Sorry" was partly performed on a week virtual concert by the artist held earlier prior to the album's release.

The album had twenty songs of Harmonize and only the two had been heard before ( "Sandakalawe" and "Teacher"). The album featured several prominent African acts including Naira Marley, Sarkodie, and Bosiswa as well as labelmates Ibraah and Anjella. Also, featured was the Tanzanian Singeli singer Sholo Mwamba. It marked a departure from the feature-heavy Afro East as it had fewer features with most songs helmed by Harmonize alone.

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• His song "Bado" Music Video won him the 2016 WatsUp TV Africa Music Video Awards for Best African Newcomer Video
• He won the 2016 African Muzik Magazine Awards (AFRIMMA) for Best Newcomer
• He won the 2016 African Entertainment Awards (AEAUSA) for Best New Artist

Harmonize Songs and Albums
• Paranawe
• Show Me What You Got
• Kushoto Kulia
• Anajikosha
• Aiyola
• Bado
• Matatizo
• Happy Birthday
• Sina
• Kainama
• Afro Bongo EP
• Afro East (Album)
• High School (Album)

Harmonize songs are included in Boomplay music playlists. Search to stream and download Harmonize songs MP3/ single/ albums on the platform.