Straight Outta Compton ruled the box office roost for the third weekend in a row, quietly pulling in $13.2 million as summer fades to black. But as USA Today notes, that was enough to propel it past Walk the Line as the highest grossing music biopic ever, with a total of $134 million. "Straight Outta Compton is taking full advantage of not only being a great movie but also having a great release in the movie calendar," says a box office analyst. "There's not a lot of competition out there right now this time of year." Christian drama War Room gave Compton some stealth competition, however, with $11 million, reports the AP. Meanwhile, Zac Efron's We Are Your Friends flopped with $1.8 million. (More box office stories.)