Starting here, new changes: the intro music has changed, the singer is a different voice, and the music is also different, a bit slower and jazzed up with some sax. Also, at the end, instead of playing clips of the show with the exit music, stills are used in their place.
Per the title, "Take Me Out to the Ball Game" is an early-20th century Tin Pan Alley song which is traditionally sung during the seventh-inning stretch of a baseball game.