This free app slaps together iPhone photos into custom slideshows scored with your pick from their library of tunes -- broad categories from pop to Latin filled with bands obscure enough to skirt licensing issues, plus plenty of public domain classical. Share the finished product with a link, or export it to YouTube, gifting the world with your potty-trained cat dropping biscuits to the sweet sounds of Carmen.

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Did we mention it's free? At Animoto.com