Many songs, albums, and videos include artwork.
Here are ways to view artwork:
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To show or hide artwork next to each item, choose View > Show Artwork Column, or click this triangle:
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To open or close the artwork viewer, click this button:
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To display artwork in its own window, click the art in the artwork viewer.
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To visually browse your iTunes library, click the middle and rightmost View buttons.
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While you are using Cover Flow (the rightmost View button), to view artwork full screen, click this button (to exit, click the button again or press Escape):
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To change the picture that shows in the artwork pane when a video is selected, play the video. When you see the frame you want to appear as artwork, Control-click the movie, and then choose Set Poster Frame.