Source of the films “The Blues Brothers” and “Coneheads,” in brief

Answer:

SNL

Hint:

This long-running sketch show launched many comedy careers and features a live band during its opening monologue.

Explanation:

This clue refers to Saturday Night Live, the long-running sketch comedy show often abbreviated as SNL. Both The Blues Brothers and Coneheads started as popular SNL sketches before becoming full-length films, which is why the clue mentions them. The "in brief" hint signals that the answer is the show's three-letter initialism.

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