With no explanation, label text_A→text_B with either "NOT ENOUGH INFO", "REFUTES" or "SUPPORTS".
text_A: Machine Head used a thrash metal sound for their album The Blackening .
text_B: Machine Head increased the complexity and technicality in their sound for the next album , The Blackening , which partially changes the sound of their first 5 albums in favor of a more classic thrash metal oriented sound , with fully complex song structures and guitar riffs .
SUPPORTS.