There are atleast two seperate artists using the name "Heaven's Cry":
1) Heaven's Cry is a band was formed in the beginning of the 1990's in French Canada as a modern rock band with a progressive tangent. They released two albums, "Food For Thought Substitute" in 1996, and "Primal Power Addiction" in 2002. They have a loose connection with Voivod.
2) Heaven's Cry is an alias used by hard dance / trance producers Jos Klaster & Richard van Schooneveld (DJ Jose and Richard Durrand)