Biography Raymond Joseph Mugerwa (born June 4, 1988), better known by his stage name Ray Signature aka Uncle Ray, is a Ugandan singer-songwriter and music producer from Kampala, Uganda. Ray Signature has written and produced songs for several prominent artists in East Africa, including Irene Ntale, Rema Namakula, Juliana Kanyomozi, Fille, Allan Toniks among others. Signature also produces music for campaigns like Reach A […]