The Beatles - Blackbird
Written by Paul McCartney early one morning in 1966 in the back garden of his house at Cavendish Avenue.
Eva Cassidy - American Tune
Composed by Paul Simon in 1975 and sung by Eva Cassidy, it is difficult not to be moved by American Tune.
Keb' Mo' - I'll Be Your Water
From the 2005 album Suitcase, the song is an interesting mixture of the melodies of Blackbird and American Tune and the motif of Simon and Garfunkel's Bridge Over Troubled Water.