Blackbird

From Wikipedia
"Blackbird" is a song by the English rock band the Beatles from their 1968 double album The Beatles (also known as "the White Album"). It was written by Paul McCartney and credited to Lennon-McCartney, and performed as a solo piece by McCartney. When discussing the song, McCartney has said that the lyrics were inspired by hearing the call of a blackbird in Rishikesh, India, and by the civil rights movement in the Southern United States.
McCartney explained on Chaos and Creation at Abbey Road that the guitar accompaniment for "Blackbird" was inspired by Johann Sebastian Bach's Bourrée in E minor, a well-known lute piece, often played on the classical guitar. As teenagers, he and George Harrison tried to learn Bourrée as a "show off" piece. The Bourrée is distinguished by melody and bass notes played simultaneously on the upper and lower strings. McCartney said that he adapted a segment of the Bourrée (reharmonized into the original's relative major key of G) as the opening of "Blackbird", and carried the musical idea throughout the song. The first three notes of the song, which then transitioned into the opening guitar riff, were inspired from Bach.
Thanks to George Clements for the guitar track. Listen to his video of this song here:
• Blackbird (Beatles Cover)