Try to imagine being in a pitch-black room and getting punched in the forehead from some unforeseen entity without warning. As you try to get up from the ground, you run into the same blunt force that knocks you down again and again and again. This could be one aural description of life-death thrash metal band known as K626. Wolfgang Amadeus Mozart knew the name K626 as his last concerto just before dying. It was a painful work in progress for him that he never got to finish.