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The Who tab displays the festival line-up, all of the artists and performers who are playing at that music festival. To the right of each artist's name you will see a speaker icon. Clicking on this icon will take you to the iTunes Music Store where, if available, you may listen to samples of the artist's music.
In some cases the Who tab may be empty or may display "To Be Announced." In these cases, this means that this festival has not yet announced its festival line-up.