Simon Frith (2004, p. 17-9) argues that, "'bad music' is a necessary concept for musical pleasure, for musical aesthetics." He distinguishes two common kinds of bad music: the Worst Records Ever Made type, which include "Tracks which are clearly incompetent musically; made by singers who can't sing, players who can't play, producers who can't produce," and "Tracks involving genre confusion. The most common examples are actors or TV stars recording in the latest style." Another type of "bad music" is "rock critical lists," such as "Tracks that feature sound gimmicks that have outlived their charm or novelty" and "Tracks that depend on false sentiment [...], that feature an excess of feeling molded into a radio-friendly pop song."