<p>Ten songs into the Pretenders' Saturday show at the Warfield, singer- guitarist Chrissie Hynde pithily summed up her group's enduring appeal and, in the process, the appeal of rock music as a whole.</p>
<p>"I think our band represents all the great losers of the world," she told a cheering sold-out crowd. "Because it's all about the losing." With that, she handed off her guitar, grabbed the microphone and led the Pretenders into the power ballad/anti-anthem "The Losing," off their 2002 album, "Loose Screw."</p>
