BUFFALO SPRINGFIELD are that rarest of beasts: an influential 1960s band whose recorded legacy hasn't been recycled into dust. Classic-rock radio stations don't dig much deeper than their one bona fide hit, 'For What It's Worth', preferring instead to play the songs of the band's splintered progeny: Crosby, Stills and Nash, Poco, Neil Young and Crazy Horse, Loggins and Messina, et al. But though the Springfield lasted little more than two years and struggled to release three albums, the group contributed as much to rock & roll as its famous divorces. This long-overdue four-disc box chronicles and illuminates that contribution.