Sir Paul McCartney has blamed music giant EMI for the delays which have prevented The Beatles back catalogue appearing legally on download services such as iTunes.

"We were having problems with iTunes – well not iTunes, EMI was the problem – with downloading, which we'd like to do because that's how a lot of people get their music," Sir Paul told the NME.

An Apple music themed event planned for tomorrow - Wednesday 9 September - at the Yerba Buena Center for the Arts Theater in San Francisco, California may yet have a Beatles tie-in.

The date also sees The Beatles back catalogue remastered and repackaged along with the launch of 'The Beatles: Rock Band,' video game for Xbox, PlayStation 3 and Nintendo Wii.

The former Beatle added that 'The Beatles: Rock Band,' offered a 'back door' for fans to download songs.

"We've kind of bypassed that [download problems] because now you can do it in 'Rock Band', I always liked that, when you're told you can't do something and suddenly there's a little route round the back."

This week's NME magazine, also on sale tomorrow, comes with a choice of 13 different covers - one for each LP release.

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