Phineas and Ferb: Across the 2nd Dimension Song Sampler is a digital soundtrack that is is in the digital copy disc of the Across the 2nd Dimension DVD. It contains 8 songs from the movie including I Walk Away sung by Olivia Olson which was not included in the previous soundtrack. It is the 8th soundtrack of the series as well as the 3rd digital soundtrack of the series, and the 2nd soundtrack for the movie.