Pearl Jam's year-long celebration of their 20th anniversary will kick-off on March 29th with the re-release of 1993's Vs. and 1994's Vitalogy as expanded editions. The discs will be released separately as well as part of a three-disc box set. 

The Vs. deluxe editions will contain a remastered version of the 1993 disc, alongside a previously unreleased acoustic version of "Hold On," a cover of Victoria Williams' "Crazy Mary" (with Williams on backing vocals) and the previously unreleased outtake "Cready Stomp."

Vitalogy's new editions will include a guitar/organ mix of "Betterman," an alternate take of "Corduroy" and an unreleased demo of "Nothingman" with Richard Stuverud on drums. The box set will also have a recording of Pearl Jam's April 12th, 1994 gig at Boston's Orpheum Theater – a fan favorite.

There will also be the option of buying a limited edition version of the set with five LPs, four CDs, one cassette, an 80-page composition notebook and a memorabilia-filled envelope. In addition to both albums on vinyl and the 1994 Boston show, the set has a cassette of a January 8th, 1995 broadcast from Pearl Jam's Monkeywrench - Self-Pollution radio series.  Vinyl editions of Vs. and Vitalogy will be sold exclusively at independent record stores on April 12th.

The band's 20th anniversary celebration will continue with the release of Cameron Crowe's Pearl Jam documentary Twenty and an accompanying soundtrack and book in the fall. Around that time the band will play a "weekend bash" somewhere in the middle of the country.

You can get more information at Pearl Jam's website.