On the soundtrack of "The Governess" (1998), Haza is the featured singer on seven of the twelve tracks and worked closely with film music composer Edward Shearmur. In 1999, she performed (together with late Pakistani artist Nusrat Fateh Ali Khan) the track "Forgiveness", on the contemporary symphony album "The Prayer Cycle" by Jonathan Elias. As a featured background vocalist, Haza's voice has been recorded, re-mixed or sampled for Black Dog's "Babylon" single, Eric B and Rakim's "Paid in Full (Coldcut Remix)", "Temple of Love (1992)" by The Sisters of Mercy, and for the M/A/R/R/S hit "Pump Up The Volume". The single "Love Song" has been re-mixed by DJs many times, its powerful vocal performance and comparatively sparse musical arrangement making it the perfect vehicle for a dance-rhythm accompaniment.