The Beatles were both musically and culturally significant, even before they reached their creative peak.
Launching the whole british invasion is not something you can just shrug off, and you can't just say "someone else could have done it", because that not only dosen't matter, no other British band had the kinda appeal that The Beatles had. The Stones, The Who, The Kinks, they would have been considered too raw, The Beatles were just the right band to break into the American mainstream, I honestly don't think anyone else would have done it.
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