For most musicians and groups, the live box set marks the culmination of a lengthy recording and concert career. Not so for Laurie Anderson, whose United States Live appeared in 1984, following her tenure in academic and bohemian circles and a small handful of releases on Warner Bros. and smaller labels. The release was an unusual event, though perhaps less so for a musician who seeks to upend musical traditions, most notably the distinctions between pop and classical, spoken and sung, live and Memorex. The lengthy set is a recording of a live performance composed of dozens of carefully defined experiments in form and technique, most of them fitting into one or two of these three categories: show pieces for items from her technological music arsenal (like her emblematic electric violin), witty narrative snippets (back when "spoken word" was called "performance art," prior to the rise of the poetry slam), and full-band performances, featuring, among others, Peter Gordon and David Van Tieghem. "O Superman" and "Big Science" are the familiar titles that appear amid the nearly 80 tracks. "Just a slow accumulation of details," her computer-enhanced voice intones moments before the intro to "Blue Lagoon" (later heard in a studio version on Mister Heartbreak). That makes a nice epigram for the collection as a whole, which is essential to understanding art music of the '80s in general and the New York scene in particular.