It’s been a long and winding road, but the Beatles are finally available on iTunes.

The legendary pop group’s 13 albums can now be downloaded through the world’s No. 1 digital music retailer, Apple said yesterday.

“I am particularly glad to no longer be asked when Beatles are coming to iTunes,” Ringo Starr said in a statement. “At last, if you want it, you can get it.”

The songs will be sold for $1.29 each, albums at $12.99, and double albums at $19.99 — in line with other premium-priced music on iTunes.

The availability of the Beatles’ hit albums like “Sgt. Pepper’s Lonely Hearts Club Band,” “Revolver” and “Abbey Road” is expected to give a boost to digital music sales this quarter and could possibly save their long-time record company EMI Group from defaulting on its debt in March, according to a person familiar with the situation.

“This could help broaden the demographic range, maybe sell more iPods,” said BGC Partners analyst Colin Gillis.

“In the holiday quarter, iPod sales really matter for Apple. We’re looking at north of 20 million iPods sold. This certainly doesn’t hurt that.”

The iTunes-Beatles agreement is exclusive into 2011, according to EMI, but the company declined to say when in 2011 it would expire.

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