The rebel in the back seat had long hair , a wild beard , and sang " the unforgiven " , his favourite tune by metallica , a rock band from los angeles .
For consistency 's sake , this year 's list is based solely on u.s. earnings which is which explains why some acts like u2 , ac / dc and metallica , which spent much of 2010 touring international markets , aren 't included in this year 's ranking .
