TexIz, or "I.Z." music, is just copyright protected lyrics performed over instrumentals from other artist to either mock them or simply just add on what Robert felt was missing, or just sounded better. No big deal, all of it's available for download on either myspace, or isound.
Robert actually started out using the alias 'TexIz' because of his name given to him when workng out of state, and bouncing down in Alabama with the Daleville Bouncers. Good Times, He shortened it to I.Z., but just decided he didn't want to go by an alias if he were to start marketing music, and simply chose his lastname.