Nine solo albums by the late George Harrison have been made available to download for the first time.
Former Beatle Harrison, pictured with wife Olivia, died in 2001
The announcement means solo music by all four members of The Beatles can now be purchased digitally.
Harrison's widow Olivia said the move - which sees George follow John, Paul and Ringo online - was "exciting".
The deal may pave the way for the Beatles' catalogue to appear online - something Olivia Harrison has said she hoped would happen by 2008.
George, she said, "had begun the digital mastering of his albums but had no idea how the digital world would change the way we access and listen to music".
Sixteen solo John Lennon albums were made available to download on Apple's iTunes earlier this year, as were works by Sir Paul McCartney and Ringo Starr.
The conclusion of a lengthy legal battle between the band's label Apple Corps and Apple Inc, which owns iTunes, paved the way for the developments.
The Harrison records available through retailers such as iTunes include All Things Must Pass, a triple album released in 1970 after the break-up of the Beatles.