In the early days of the web, I used to go hunting for Beatles Bootlegs. I scoured forums, emailed dodgy geezers, and swapped poorly encoded RealAudio™ files on USENET. The Beatles had recently released their Anthology series, and us nerds were desperate to hear more unreleased goodies. Sure, there were rarities and out-takes, but we wanted more. We wanted Ultra Rare tracks. That one song no o…