At the outset of the 1970s, Blood, Sweat & Tears were riding high with an enviable succession of million-selling singles (“You Made Me So Very Happy,” “Spinning Wheel,” “And When I Die”) pulled from ...

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Imagine an on-the-road concert documentary shot in the anything-goes days of 1970 — a hurly-burly vérité jamboree like “Mad Dogs & Englishmen” or “Elvis on Tour.” It’s about the biggest rock band in ...