A new Beatles compilation ‘Tomorrow Never Knows’ was released today (July 24) exclusively on iTunes, and Foo Fighters frontman Dave Grohl has written a letter in the digital liner notes of ‘Tomorrow Never Knows’ describing the impact the group’s music had on him. The 14 song collection includes what is described as the band’s ‘most powerful rock songs’ such as ‘Revolution,’ ‘Paperback Writer,’ ‘Helter Skelter’ and ‘Back In the USSR.’ A