It's the early '70s. One of the most popular rock bands of the era, Grand Funk Railroad, is onstage playing to a sell-out crowd. During a less-than-inspired guitar solo, someone in the audience starts booing loudly. The booing continues even after the song is done. Annoyed, the guitar player steps up to the mic and says, "Whoever you are, if you think you can do better, come on up here." Up walks Eric Clapton...

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