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Chris

4 across - 6 act cut in two - hospital for one week (3,3) where the answer to 6 down is Woodstock, the theme of the puzzle.

Put HEW (cut) inside TWO and you get THE WWO. Now swap the second W (one Week) for an H (Hospital) and you finish up with The Who.

Thanks, Big Dave. I should have seen it - I got as far as HEW for cut, and TWO, but missed the H for W substitution.