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How to create a musical slideshow with iphoto
Choose the photos you want to show during your video.
Choose your music; make sure whatever song you choose is not drm protected.
You can use songs you have bought from the itunes store, and you should not use any song that you do not have express permission to use.
Make sure your photos and your music are in digital formats that will work with itunes and iphoto. That means scanning your photos and importing them into your iphoto library and ensuring that your music is in your itunes library as well.