Joni Mitchell's 1970s and '80s forays into jazzier territory may have distressed her folkie faithful, but they also resulted in some uncompromising, challenging, and, yes, entertaining music. Witness this 73-minute document from her '79 tour, which finds her backed by her greatest band ever. Mitchell's The Hissing of Summer Lawns-Hejira-Mingus period is heavily favored; there are two tunes from Court and Spark, but nothing earlier. It's not perfect--the film clips edited into the live tracks (at Mitchell's direction) are an annoying distraction (Rebel Without a Cause? Huh?). But by the time Mitchell, Mays, and vocal group the Persuasions finish a spine-tingling version of the title song, you'll have witnessed something special--and historic, as this was the only time this stellar crew toured together. --Sam Graham