Like OutKast, reunited college-rock legends The Replacements seem content to stick strictly to festivals, the latest of which is the just-announced two-weekend Austin City Limits Music Festival in October, where the ‘Mats will join headliners Eminem, Pearl Jam, Skrillex, Beck and, of course, OutKast on the massive bill.

Coachella’s second weekend is under way now, and The Replacements took the stage tonight for the second of the reunited band’s appearances at the two-weekend fest — and dropped a big surprise on the crowd, as Green Day’ Billie Joe Armstrong joined the ‘Mats for part of the band’s set.

The Pet Shop Boys brought their current Electric production to Coachella this past weekend for the first of two appearances at the California festival, delivering a 19-song set over the course of 80 minutes that was heavy on visuals, as is to be expected from the duo.

Having performed Blondie’s “Heart of Glass” at a pair of tour stops last week, Arcade Fire added a special treat during its Sunday night headlining set at Coachella: Debbie Harry herself, who joined the band to sing the 1978 hit. The Blondie frontwoman stuck around for “Sprawl II (Mountains Beyond Mountains).”

Ten years ago, the Pixies used Coachella to formally launch their comeback, so it’s fitting the band returned to the festival this weekend as a very late addition, playing a 15-song, 50-minute set that featured old favorites and a handful of tracks that will be included on upcoming album Indie Cindy.

The Cult took to the stage at the Coachella festival late into the evening on Friday, playing an 11-song, 50-minute set that drew on classics (“Love Removal Machine,” “Rain,” “Wild Flower,” “She Sells Sanctuary”) as well as newer material recorded in the last few years.