Tempo Magic will access existing playlists from your built-in "Music" app in iOS 5 or "iPod" app on iOS 3 & 4. This way, you can have playlists saved for your 8:00 class, your 11:00 class, and your 3:00 class and easily load them up quickly in Tempo Magic. Here's how you do that:
Open the Music app on your iDevice and go to the 'Playlists' tab. Tap 'Add Playlist'. Name the playlist. Then select the songs you'd like to add to the playlist. Hit 'Done' when you've added all the songs you want to use. You can tap 'Edit' when viewing the playlist if you decide you want to delete and/or rearrange any songs. When the playlist looks good, close down the Music app and open Tempo Magic.
In Tempo Magic, tap the playlist button in the bottom-left corner. This will take you to your Magic Playlist. Tap the trash can to empty the Magic Playlist. Then tap 'iPod Music' to add songs that are on your device. Tab over to 'Playlists' and you'll see the playlists on your device, including the one we just made in the Music app. Select that new playlist and hit 'Add All Songs' to add the entire playlist to your Magic Playlist. Then tap 'Done'. Tap 'Done' once more to exit from the Magic Playlist view and head back to the main view in Tempo Magic.