Issah Mmari Wangui, professionally known as E-Sir, was born on May 20th May 1981 in California Estate, Nairobi, Kenya. E-Sir was a Kenyan hip hop artist signed to Ogopa DJs record label. Many of Silverstone E-Sir’s songs become very popular and trendy online with a great number of streaming and downloads on Boomplay.

E-Sir is considered by many as the greatest Kenyan rapper of all time due to his lyrical prowess and his mastery of Swahili language evident in his raps.

E Sir played a vital role in spearheading Kenyan hiphop into the mainstream, competing highly with international music. E-Sir’s talent and iconic discography has left a lasting legacy in the Kenyan music industry, cementing himself as a Legend. E- Sir passed away on March 16, 2003 when he was only 21 years old.
E-Sir rose to stardorm in 1999 after releasing his debut single "Jo" which was a moderate success Kenya. He signed to Ogopa DJs Record Label which produced his debut album titled Nimefika in 2003. Nimefika was well received spawning back to back hits which dominated Kenyan airwaves.

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E-Sir Songs
E-sir’s most popular hits include;
• "Mos Mos"
• "Boomba Train"
• "Hamunitishi"
• "Leo ni Leo"

His only posthumous song was the collaboration between him and Nameless called "Maisha

• E-Sir won four Kisima Awards in 2003 which included;
• Song of the Year for "Boomba Train"
• Best Male & Hip hop Artist of the Year
• Best Album of the Year for Nimefika.
• E-Sir was also nominated for the following awards;
• Best East African Artist- Kora Awards 2003
• Best East African Album- Tanzania Music Awards 2004
• Most Downloaded Hip-Hop Artist - Mdundo Awards 2007

E-Sir’s songs are included in Boomplay music playlists. Search to stream and download E-Sir’s songs MP3/ single/ albums on the platform