Onesimus started singing at the age of 13. His love for singing grew as he performed at different concerts around his community. Apart from singing, Onesimus also has passion for dancing as he first gained expression at the age of 17 when his dance group won the Sprite competition in 2006.
Armstrong started singing secular music in 2010 and finally released two singles: “Beautiful” featuring award-winning Malawian rapper Young Kay and “Without Your Love” which landed him a coveted deal with the record company ‘Nde’feyo Entertainment’. Almost instantly thereafter he began his tour in Malawi under the stable, in 2011. He dropped a R&B mixtape titled ‘BRB’ in 2012 and - in the same year - dropped his debut Afro R&B album: “Ndele”. In this album he showed his diversity as he also sings in his mother-tongue - Chichewa.
By this time he had already worked with several of Malawi's urban music icons and also did a song called “Musiye Ayende” with Zambia's musicians Dalisoul and Afunika. He made appearances on many line-ups at acclaimed music festivals in Malawi sharing stages with the continent's industry giants: Oliver Mtukudzi, Freshly ground, Salif Keita, Professor, AKA, Naeto C.
To date Onesimus’s Songs continue to resonate with audiences internationally, aligning him with African Heavy weights like Tekno (nigeria) Vusi Nova (SA) and many more.