According to Paul McCartney, EMI Music is the reason there's no Beatles music for sale on iTunes.

"It's been business hassles, not with us, or iTunes," he told BBC Newsbeat. "It's the people in the middle, the record label. There have been all sorts of reasons why they don't want to do it."

The Beatles catalog is the largest, most glaring missing element of iTunes, which is the world's largest music retailer of any format today. McCartney in the interview added that he expects a deal to bring band's music to iTunes will happen "one day."

EMI meanwhile responded: "Discussions are ongoing. We would love to see The Beatles' music available for sale digitally."

some of the bigger hits