The Benefit tour was quite nicely documented. Apart from the Carnegie Hall and Isle of Wight shows, which has been already released, the Tanglewood show (with The Who) was recorded and videotaped. I don't know if Tull's set at the Randall's Island show was recorded and filmed, but it's possible. After Benefit tour it seems that there were no professional multitrack live recordings until the 1975 Paris show.
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