Premise: Hit Parader was an American music magazine that operated between 1942 and 2008. A monthly publication, it was a general popular music title until the 1980s, when its focus turned to the genres of hard rock and heavy metal.<ref name="RBP/HP"> </ref> The magazine reached its peak during the 1980s as heavy metal music achieved high levels of popularity and commercial success.
Hypothesis: Hit Parader operated for 80 years