Question: What is the title of the live album released by Capitol Records in 1977 that was followed by Live at the BBC as the first official release by the same band of previously unrecorded performances?
Sentence (from "Live at the BBC (Beatles album)"): It was the first official release by the Beatles of previously unreleased performances since "The Beatles at the Hollywood Bowl" in 1977 and the first containing previously unreleased songs since their final studio album, "Let It Be", in 1970.
Relevant evidence: Yes