Task: Question Understanding
Input (English): Context : Alternative Press (p. 108) gave it 3.5 stars out of 5 and said, ``A-Lex deftly fuses the band's many stylistic phases, from the thrash and death metal that launched their career to later explorations of punk, hardcore, groove metal and even tribal rhythms.'' 
Question : The A-Lex is based upon what?
Output (English): based on