As he continues to work on his own box set retrospective, Stephen Stills has mined his distant and recent pasts for a pair of fall archival releases.

On Sept. 22 the singer, songwriter and multi-instrumentalist will release "Manassas -- Pieces," a 15-song collection of outtakes and rarities -- "The bits and pieces we were silly enough to leave off," Stills writes in the liner notes -- from the country rock band he formed in 1971 with Chris Hillman of the Byrds and the Flying Burrito Brothers. Manassas released two albums, an eponymous two-disc set in 1972 and "Down the Road" in 1973; "Pieces" includes alternate versions of two "Down the Road" songs, "Do You Remember the Americans" and "Lies," the latter featuring Joe Walsh on guitar. It also features Manassas versions of "Word Game" and "Sugar Babe," which first appeared on "Stephen Stills 2" in 1971, as well as "Like a Fox," which features a then-fledgling Bonnie Raitt on backing vocals.

In the "Pieces" liner notes, Stills waxes fondly about Manassas as "the first steel-guitar-driven country/rock band that any of us can remember... Whatever else has been said about this time of immense creativity, what Manassas turned out was a collection of material that remains the precursor of virtually all of the Nashville country rock productions that followed during the next decade. The energy is unrepentant, the creativity irrepressible, and the value of these recordings irrefutable."

Stills will follow "Pieces" with the Oct. 27 release of "Live at Shepherds Bush," a CD/DVD set recorded and filmed last fall at a Stills solo show in England. The collection features both solo acoustic and full band sets, as well as songs from Buffalo Springfield, Crosby, Stills & Nash (& Young), Manassas, the Stills/Young Band and Stills' solo recordings, along with covers of Bob Dylan's "Girl From the North Country" and Tom Petty's "Wrong Thing to Do."

There's no word on when Stills' box set will be released or of plans for a recording of him jamming with Jimi Hendrix in 1968. Stills last studio album, "Man Alive!," came out in 2005, while he, David Crosby and Graham Nash are currently recording a covers album with producer Rick Rubin.

The track listing for Stills' upcoming releases include:

MANASSAS, "PIECES"
(*previously unreleased)
"Witching Hour"*
"Sugar Babe"*
"Lies" * (with Joe Walsh)
"My Love Is A Gentle Thing"
"Like a Fox"*
"Word Game"*
"Tan Sola Y Triste"*
"Fit To Be Tied"*
"Love and Satisfy"*
"High & Dry"*
"Panhandle Rag"*
"Uncle Pen"*
"Do You Remember the Americans"*
"Dim Lights, Thick Smoke (and Loud, Loud Music)"*
"I Am My Brother"*
 
LIVE AT SHEPHERDS BUSH
Acoustic Set
"Tree Top Flyer"    
"4&20"      
"Johnny's Garden"    
"Change Partners"    
"Girl From the North Country"  
"Blind Fiddler"    
"Suite: Judy Blue Eyes"    
Electric Set
"Isn't it About Time"   
"Rock & Roll Woman"   
"Wrong Thing To Do"
"Wounded World"    
"Bluebird"     
"For What It's Worth"   
"Love the One You're With"