It was hotter than anyone could have dreamed possible for August in SF yesterday, and the sun stayed out much of the day for the opening of the Outside Lands Music Festival in Golden Gate Park yesterday. Many fans of all ages showed up, and judging from the crowd on the Polo Field around 8 p.m., Pearl Jam is still huge! Who knew. Here we bring you some pics from the scene, including Akron/Family, Los Campesinos! (who were sort of like The Psychedelic Furs meets Le Tigre), Silversun Pickups, Blind Pilot, The National (who were phenomenal), Thievery Corporation, and of course, the now white-haired but still rocking Tom Jones. Apologies for all ye Eddie Vedder fans -- there were special approvals required to photograph His Highness, and we were not among the chosen.

Today's lineup includes The Mars Volta and TV on the Radio, as well as Jason Mraz and Dave Matthews for all you softer souls. See our recs for Saturday and Sunday here, watch videos from yesterday and live coverage today on YouTube, and on Sunday you can follow @johnhughesdead on Twitter for live updates from "the Tripping Fields."