In 1965 a group called the Charles River Valley Boys did an album of Beatles in bluegrass for the Elektra label.As the songs of Lennon & McCartney were inspired in the first place by American music they were perfect to interpret as country music and I've just seen a face is ascloseasthis to the genuine article.
Liverpool had a strong tradition of country music in any case and the Beatles always used what was there on their own doorstep.
Today its pretty common to find bluegrass versions of the most unlikely songs even heavy metal ones which is rather flogging the idea.(A recent one of metal done bluegrass style is called Weapons of Grass Destruction!)
The Beatles are the prime movers in this department having actually inspired many American groups such as the Byrds or even Bob Dylan 
The Grassmasters are actually session musicians who may be the same ones who do all the bluegrass interpretations.
But this one sounds authentic
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If you are one of those die-hard Beatles fans who also happens to perk up at the mentioning of bluegrass, you have found a little piece of heaven with Grassmasters' album, "Beatles Grass." Just as the name suggests, these are bluegrass arrangments thumping and lilting through some of the best tunes by the Beatles. With sweet, singing fiddle, ringing mandolin and the usual country folk get-up, this group gives a fresh, danceable, especially earthy context to some of the greatest songs ever written. Without too much flair or flash, these interpretations are true, simple and shoot straight for the heart. 
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