http://www.musictheory.net/ has been crawled 656 times going all the way back to August 15, 2000.

A crawl can be a duplicate of the last one. It happens about 25% of the time across 420,000,000 websites. FAQ
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January 2, 2011

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April 27, 2011

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May 11, 2011

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May 15, 2011

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July 18, 2011

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July 23, 2011

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July 26, 2011

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Sep
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Note

This calendar view maps the number of times http://www.musictheory.net/ was crawled by the Wayback Machine, not how many times the site was actually updated. More info in the FAQ.