The four live albums include original vocalist Signe Anderson's farewell show and Grace Slick's first show, both at the Fillmore in 1966. Here is the announcement with more details:

The argument rages on, but for many music fans in the '60s, the best live band from the Bay Area was Jefferson Airplane. Formed during the summer of 1965 in San Francisco, the group triumphed in 1967 with Surrealistic Pillow, one of the key recordings of the Summer of Love, containing the hits "Somebody to Love," "White Rabbit" and "Today." The Airplane featured three master instrumentalists (Jorma Kaukonen, Jack Casady and Spencer Dryden) and three vocalists: Grace Slick (replacing original singer Signe Anderson in 1966), Marty Balin and Paul Kantner. The Rock 'n' Roll Hall of Fame inductees made a total of eight studio albums and released a smattering of live albums including 1969's Bless Its Pointed Little Head.

But what most fans don't know is that there are vast reserves of never-released live material by Jefferson Airplane capturing key moments in their history. On October 26, 2010, Collectors' Choice Music Live will release four previously unreleased live albums: Live at the Fillmore Auditorium 10/15/66 Late Show — Signe's Farewell, Live at the Fillmore Auditorium 10/16/66 Early & Late Shows — Grace's Debut, Live at the Fillmore Auditorium 11/25/66 & 11/27/66 — We Have Ignition, and Return to the Matrix 2/1/68.

The first three releases document the astonishing growth of the band, and follow the near-seamless absorption of Grace Slick's voice and material into the Airplane's sound just as they were entering the studio to record Surrealistic Pillow. The fourth release captures the group triumphantly returning to their home turf at Marty Balin's club The Matrix for a relaxed, exploratory set in an intimate setting, performing material from their first four albums, including Crown of Creation, seven months before its release. Taken together, the four releases confirm that at its best, when Jorma was soaring, Jack rumbling and the three voices joining in ecstatic melisma, no other band could ascend to the heights attained by the Airplane. Hand-picked by a team of devotees, annotated by frequent Airplane flyer Craig Fenton (author of the book Take Me To A Circus Tent: The Jefferson Airplane Flight Manual), and featuring rare photos inside handsome digi-packs, these concerts distill and express the dream and promise of the Haight-Ashbury scene.

• Live at the Fillmore Auditorium 10/15/66 Late Show — Signe's Farewell: The Grace Slick era of the Airplane has understandably received most of the attention paid the band over the years. But they had released a good album (Jefferson Airplane Takes Off) and were already a powerful live outfit before Slick came aboard. The 10/15/66 release not only marks the first appearance on CD of a live recording featuring Signe Anderson with the band, but also her very last show. Both Marty Balin and the Fillmore's Bill Graham give her shout-outs. Songs include "3/5ths of a Mile in Ten Seconds," "Tobacco Road," "Midnight Hour," "High Flyin' Bird" and "Chauffeur Blues" (which Grace never performed out of respect for Signe, who'd made the old blues tune her own). It was the end of an era. But a new one was about to begin the very next day, and is the subject of the 10/16/66 release.

• Live at the Fillmore Auditorium 10/16/66 Early & Late Shows — Grace's Debut: The 10/16/66 volume chronicles the first set of concerts featuring Grace Slick as a member of the Airplane, a mere day after Signe Anderson officially left the band. The band has yet to add the material Slick brought to the band ("Somebody To Love" and "White Rabbit) to the set list, but Grace's harmony work with Marty and Paul is impressive, and you can literally hear her confidence growing from the first set to the second. The album contains "The Other Side of This Life," "Let Me In," "Don't Let Me Down," "Run Around" and "High Flying Bird," plus versions of "3/5ths of a Mile in 10 Seconds" and "Tobacco Road" with the new line-up, and Leiber & Stoller's "Kansas City," which has never appeared on any Airplane studio or live album. Surrealistic Pillow photographer Herbie Greene contributes photos. Things would never be the same for the band or for '60s rock.

• Live at the Fillmore Auditorium 11/25/66 & 11/27/66 — We Have Ignition: CCM Live subtitled these shows "We Have Ignition" as they believe this is when the Airplane transformed from a high-flying bird into a psychedelic spaceship (but not yet a Starship.) It's difficult to believe, when comparing these November shows with Grace's live debut on 10/16/66, that only six weeks have elapsed. Not only has the band (particularly guitarist Jorma Kaukonen) progressed as musicians, but the infusion of Surrealistic Pillow material some four months before the album hit the stores shifts the focus of this folk-rock band to rock. Included are "Plastic Fantastic Lover," "High Flyin' Bird," "Bringing Me Down," " D.C.B.A-25," "My Best Friend," "Go to Her," "She Has Funny Cars," "3/5ths of a Mile in 10 Seconds," "Skip Spence's "J.P.P. McStep B Blues," "White Rabbit," "Today" and more. Two rarities are a mind blowing, 9:45-minute version of "The Other Side of Life" (performed for a photo session) that neither its author, the folk singer-songwriter Fred Neil, nor the band could ever have anticipated, and the only known recording of an instrumental known in some quarters as "My Grandfather's Clock." This is the Airplane at its early apex.