<P> Pop music is a genre of popular music that originated in its modern form in the United States and United Kingdom during the mid-1950s . The terms `` popular music '' and `` pop music '' are often used interchangeably , although the former describes all music that is popular and includes many styles . `` Pop '' and `` rock '' were roughly synonymous terms until the late 1960s , when they became increasingly differentiated from each other . </P>
<P> Pop music is a genre of popular music that originated in its modern form in the United States and United Kingdom during the mid-1950s . The terms `` popular music '' and `` pop music '' are often used interchangeably , although the former describes all music that is popular and includes many styles . `` Pop '' and `` rock '' were roughly synonymous terms until the late 1960s , when they became increasingly differentiated from each other . </P>
when did pop music started in what year
when did pop music started in what year
mid-1950s
mid-1950s