This version is a duet by Paul Simon and George Harrison.
"Here comes the sun" is a song by The Beatles from their 1969 album Abbey Road, and it was written by George Harrison.
According to Wikipedia, "Harrison wrote the song in early 1969 at the country house of his friend Eric Clapton, where Harrison had chosen to play truant for the day to avoid attending a meeting at the Beatles' Apple Corps organisation. The lyrics reflect his relief at the arrival of spring and the temporary respite he was experiencing from the band's business affairs."
When I hear this song, I get a pleasant feeling of experiencing the sun light and warmth after gloomy/cloudy days. It also reminds me of the joy of meeting up with someone I love and seeing their beautiful smile shining like the bright sun! Ahh ...