Let's get one thing straight: excluding the iPhone and iPod Touch, Apple has not created any game-playing devices. Contrary to what its maker may say, the iPod classic, fifth generation iPod (the standard device that can run videos) and iPod Nano with video were not designed to play games of any serious value. Yet when Square Enix decided to create their first iPod offering – Song Summoner: The Unsung Heroes, a turn-based strategy/RPG – it chose to release it on the three latter devices. The iPhone and iPod Touch were likely excluded by default, as their architecture is very different from the iPods of yore.
Thus, when (if) you dive into Song Summoner, know that the game you are about to play is an attempt to provide some fun on a device that isn't equipped to deliver it.