Alabama Shakes’s soulful rock boogie is a massive early afternoon draw over on the Sutro Stage.  They’re getting it done, like a band that has played together for a long time, even though they’re only a couple three years into this game.  Brittany Howard has carved out some fairly unique territory as a young leading lady for a heavy throwback band. Keep an eye on these kids…  The welcome return of Grandaddy after something like a six year break is a high point of the afternoon.  Fittingly among the trees, their crunchy melodic tunes sound fresh as ever, synth bleeps and boops transmitting through the cool park air.  J. Lytle’s recurring themes of nature, technology, ambition, suburban escape still resonate. They end with the epic album opener He’s Simple, He’s Dumb, He’s The Pilot and the smallish dedicated crowd is willing to stay the distance with them for it’s 7+ minutes…  Thee Oh Sees, with their manic garage jangle and hooks, next rocked a smaller side stage (at this point I’m losing track of the stage names) whipping kids into crowdsurfing.  Why anyone needs the Black Lips at all with these guys going is a mystery…  Passion Pit really have become the big stage act I admittedly did not think they had it in them to be. It’s almost as if the sheer will of their fans propelled them to and they just took it and ran with it.  Hats off to them…  Sigur Ros is my night-ender. They’re overwhelming on the senses, as they often are.  Their dynamics and power has evolved over the years to let in more whimsy, dropping the seriousness a bit here and there to reveal more humanity perhaps.  I don’t think Jonsi would have made cracks about competing with Metallica a few years ago, whereas now he’s well at ease enough to do so…