SAN FRANCISCO – "Welcome to Googlepalooza," Jane's Addiction frontman Perry Farrell (and Lollapalooza mastermind) said as he greeted the crowd at Google's I/O conference Tuesday night.

The band had just kicked off its 45-minute set, which closed out the first day of the annual developer event. Google has posted the entire Jane's Addiction performance on YouTube, where you can watch it in HD (embedded above).

Around 5,000 attendees are packing Moscone Center here this week, attending keynotes and sessions about Android and Chrome during the day – and hitting some gigantic parties at night. The Jane's Addiction set came as a bit of a surprise – word leaked out Tuesday that the band would be playing at the free after-hours party, and attendees changed their dinner plans in order to file back into Moscone to witness the show.

The ballroom was done up like the floor of a rave, with neon signs, bikes and robots everywhere, plus giant dancing Android mascots. Given all the revelry, the band seemed a bit subdued – musicians rarely bring their best game to corporate gigs – but the boys gave it a solid go anyway. Most of the original band, which formed in Los Angeles in the mid-1980s, is still intact, with Farrell on vocals, Dave Navarro on guitars and Stephen Perkins on drums. Newcomer Chris Chaney plays bass.

Farrell, now in his early 50s, was a little winded after whipping around the stage during the first two songs, "Stop" and "Ain't No Right." But after a few sips of wine chugged straight from the bottle, as is his style, he loosened up.

He gently ribbed his corporate benefactors between songs. "You can find all sorts of internet porn on Google, right?" he asked. He also invited YouTube to place a camera in his bedroom to broadcast his sex life on the web – but only if they paid him $25 billion dollars.

The band certainly scored a huge payday for its appearance, and Farrell joked about it. "I don't even know what we're getting paid for this ... we're doing it just because," he said, before kicking into one of the band's more recent tunes, "Just Because."

They also played "End to the Lies," a new song that will show up on the band's new album in August. The group is recording it now with producer Rich Costey and TV on the Radio's Dave Sitek.

The ballroom at Moscone was filled with geeks of all stripes: web and mobile application developers, programmers, Google employees and suits from Google's various business partners. Earlier in the day, Google had given away free Samsung Galaxy tablets to every conference attendee, and many were testing the device's video capabilities by shooting their own videos of the concert.

>We got a glimpse of the grim future last night as full-size tablets were held high, blocking the view of everyone further than 10 rows from the stage.

It's the smartphone era now – you can't go to a show without the bonehead in front of you holding up his handset to capture shaky, dim video clips – but we got a glimpse of the grim future last night as full-size tablets were held high, blocking the view of everyone further than 10 rows from the stage.

Even with all the filming and tweeting happening around me, I felt an immediate warmth from seeing the band up there working the room. Things were stiff at the beginning, but they got better and more free as the songs ticked by. "Been Caught Stealing," "Ted, Just Admit It" and "Mountain Song" were all energetic. There was even a small mosh pit – if you've never seen software developers try to mosh, it's a laughable sight, to say the least – but it had the vibe of an ironic statement more than an earnest release of rebellious energy.

The band closed up with a tidy reading of "Jane Says." I sang along, and I noticed only a few people around me knew the words. I'm sure a few hundred souls in the room were in diapers when that song was a hit.

The band left smiling and waving, but didn't play an encore. What, Google couldn't cough up an extra 20 grand?

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