The Best, Most Nostalgic Part of Grey's Anatomy's 300th Episode Is the Music

What a special moment. This easy-to-recognize song is the very first track featured on Grey's Anatomy. Just after Meredith kicks her one night stand, Derek Shepherd, out of her house, we descend into the first minutes of the intern program at Seattle Grace Hospital. In the 300th episode, it's the last song that plays as we close out the episode. Talk about a full circle.