50th anniversary edition of the legendary band's third studio album. Disc 1 features both of the official mixes of the album, the 1969 mix and the 1971 remix, which was overseen by Phil Lesh and Jerry Garcia. The original 1969 mix had been lost for decades before turning up in the early 2000s, and it's included here on CD for the first time, along with its more well-known 1971 remix. The differences in the mixes at times are subtle and nuanced, and at others are glaring and dramatic, and it's incredibly fun to contrast and compare. The second disc features a live performance by the band at the Live at the Avalon Ballroom in San Francisco.