Young's work has called into question the nature and definition of music . " Vulture " described him as the most influential living composer today . " The Observer " wrote that his work has had " an utterly profound effect on the last half-century of music . " His evolving composition " The Well-Tuned Piano ", first conceived in 1964, has been characterized as " one of the great achievements of 20th-century music " by " The Guardian ".
