[Greg Jones]

I'd probably use folders for this as well, but you can create action groups (project inside a project) on the iPad. First, create an action inside an artist's name project, and give that action the name of a song. Then create an action related to the song, bring up the info panel for it, and select 'Move'. You will then have the option to move the task inside another item. Select your song from the list and you all all set.