also released several compilation albums and box sets. Studio and contemporary live albums Unconventionally, the Grateful Dead made the release of live albums a common occurrence throughout their career. Because many were recently recorded and included previously unreleased original material, they often filled the role of traditional studio albums. An integral part of the contemporaneous evolution of the band, such live albums are included in this section. Compilation albums Box sets Retrospective live albums Traditional releases Dick's Picks In the 1990s and 2000s, the Grateful Dead released numerous live concert recordings from their archives in three concurrent series. The "From the Vault" series are remixes of multi-track recordings made at the time of the concerts. The "View from the Vault" series are also multi-track remixes, but are released simultaneously as albums on CD and as concert performance videos on DVD. (The first three volumes were also released on VHS videotape.) Both of these series are included in the "Retrospective" live albums list above. The third series of concert releases is Dick's Picks, which are based on two-track concert recordings. Unlike multi-track recordings, two-track recordings cannot be remixed, only remastered. Therefore, the sound quality of the Dick's Picks series, while generally very good, is not quite as high as that of the other official releases of live recordings, as explained in the various "caveat emptor" notices on the CD boxes. The Dick's Picks series, which started in 1993, was named after Grateful Dead tape vault archivist Dick Latvala. Latvala selected shows with the band's approval and oversaw the production of the albums. After Latvala's death in 1999, David Lemieux became the Dead's tape archivist and took over responsibility for producing subsequent Dick's Picks releases, as well as his own Dave's Picks series. Latvala and Lemieux worked with recording engineer Jeffrey Norman, who was in charge of mastering the CDs. The last Dick's Pick's compilation was released in 2005. Volume 15 and later were released in HDCD format. This provides enhanced sound quality when played on CD players with HDCD capability, and is fully compatible with regular CD players. Digital Download Series In the summer of 2005 the Dead began offering download versions of both their existing live releases, and a new Internet-only series, The Grateful Dead Download Series, that was available through their own online store (which offered the albums in both 256 kbit/s mp3 files and FLAC files – a