Tim Mercer

Images via YouTube and Takahiro Kyono

Adam Barrett covers 'God Only Knows' co-written by Brian Wilson.

Adam Barrett has been steadily building a fan base on YouTube with his acoustic guitar covers of iconic songs from musicians and bands like The Beatles, The Cure and Oasis.

Last year, Barrett uploaded a cover of The Beach Boys song "God Only Knows," from their iconic "Pet Sounds" album. It's a song so good that Paul McCartney once called it the "greatest song ever written" and has repeatedly praised it over the years, including in 2007 when he performed the song live with Wilson.

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