Good Day Sunshine
Paul McCartney wrote this on a sunny day at John Lennon's house. It was influenced by the Lovin' Spoonful, who had a happy hit with "Daydream." The song is a popular pick for the wake-up music on space station missions. In November 2005, McCartney himself played it live to the crew of the ISS. Guess you might as well have a sunny, happy number to start your day when you're crammed into living space the size of a bus surrounded by infinite vacuum.