Ringo Starr's post-Beatles EMI (LSE: EMI) catalog goes up for sale digitally today, making him the third Beatle whose solo catalog has become available on digital retailers such as 7digital.com and Apple (NASDAQ: AAPL)'s iTunes Store. Starr's EMI catalog, which includes four albums released between 1970 and 1974, joins the rest of his catalog in those online stores. Today also marks the release of a new compilation CD from Ringo under the EMI banner to promote the online offering, the first time the drummer has been with the British music giant since his Beatle contract ended in 1975.

The solo catalogs of Paul McCartney and John Lennon have been for sale for three months and two weeks, respectively, though the digital sale of Ringo's catalog was announced shortly after McCartney's became available. Lennon's catalog was issued online quite unexpectedly earlier this month. The only catalog not available digitally is George Harrison's, which has seen new CD remasters released periodically over the past seven years. Of those remasters, only last year's update of Living in the Material World and this year's reissue of the Traveling Wilburys collection are available from various digital retailers.

Rumors continue to circle that The Beatles catalog itself may be issued by the end of this year or sometime early next year, but nothing has been confirmed or denied. In the past year alone, The Beatles have experienced a kind of celebratory resurgence after the opening of the Las Vegas Cirque du Soleil show, Love, and the release of the accompanying soundtrack album. The month of June witnessed various solo and related projects from the Beatles members charting high in the Billboard 200 (the only Beatle missing was Ringo). The new digital catalog and accompanying compilation may change that fact, giving all four Beatles hit albums in 2007. A film due for release next month will additionally explore the music of The Beatles and the time period they lived in.