The song is "Here comes the sun" by The Beetles

Here comes the sun, doo-doo-doo-doo Here comes the sun, and I say It's alright Little darlin', it's been a long, cold, lonely winter Little darlin', it feels like years since it's been here Here comes the sun, doo-doo-doo-doo Here comes the sun, and I say It's alright Little darlin', the smile's returning to their faces Little darlin', it seems like years since it's been here Here comes the sun Here comes the sun, and I say It's alright