Delvis Kasaloo Kyanga a.k.a Jonstar, is a Tanzania music producer, Television and radio producer born n Iringa (Region) and raised in Dar Es Salaam where he attended University Of Dar Es Salaam (School Of Journalism and Mass Communication). He has worked with different artists from different nations like  TG from Nigeria, Priest from Ghana, Picolcr Swiss from Congo, S2TF from Congo DRC, Toxic Crew from Zambia, Issam Touchez (Tanzania) and Asendua Tha Cross from Ghana. Jonstar has also worked with Mlimani Radio.