According to a number of UK-based online sources, Paul McCartney has officially worked out a deal to bring the Beatles back-catalog to multiple music download sites including a $400 million agreement with iTunes to offer the tracks. All of the Beatles currently have works available for download through iTunes, but the likely most popular tunes have thus far eluded the mammoth music download service.

According to reports, albums including Sergeant Pepper’s Lonely Hearts Club Band, Help and the White Album could be available from iTunes on possibly other online services “within months”. Now that the deal has been worked out, officials for the Beatles are reportedly in the process of creating digital versions of the songs to be available for download.

The solo work of George Harrison has now been added to iTunes making him the last of each of the Beatles to be available through the site, preceded by Paul McCartney, John Lennon and Ringo Star. Unfortunately the Beatles as a group are still not available on iTunes, just the solo work of each artist separately with no word of any Beatles albums as of yet.

Apple has announced that 16 solo works by John Lennon through EMI are now available for download through iTunes. These songs will also be offered as part of the iTunes Plus program where you can pay an extra 30 cents to get the songs DRM-free and at 256 kbps AAC encoding.

“John would have loved the fact that his music will now be available in a format suited to a new generation of listeners,” said Yoko Ono in the Apple press release

Lennon marks the second of …