Pearl Jam have announced the launch of their latest collection of official bootlegs, a new line called the 'Instant Classic' series. The first of such gigs offered from the series is PJ's only 2012 headlining performance, a Sept. 30 show in Missoula, Mont., which they performed in support of Democratic Senator Jon Tester's ultimately successful reelection campaign.

Check out video above of PJ performing the MC5 classic 'Kick Out the Jams' with members of Mudhoney during the Missoula show. The entire concert is currently available as an MP3 bootleg for $4.99 on the band's official website, with profits going to Missoula's Poverello Center, a nonprofit dedicated to helping the homeless. After Nov. 13, the show will be available for the standard price of $9.99 in MP3, CD and high-quality FLAC and FLAC-HD formats.

PJ suggest that more gigs will be deemed 'Instant Classics' in the future and thus be granted official bootleg status. "Every so often, performances like this stand out immediately as 'one for the books' in the band's eyes," reads a post on PJ's site. "When they do, these 'Instant Classics' will continue to be made available with this special offer."

Watch Pearl Jam and Members of Mudhoney Perform MC5's 'Kick Out the Jams'