Add music to a slideshow
Do one of the following:
Select the slideshow in the Source list, and then click the Music button in the toolbar. (If you’re in full-screen view, first exit it by moving your pointer to the top of the screen and clicking the Full Screen button that appears in the top-right corner.)
While a slideshow is playing, move the pointer to make the slideshow controls appear, and then click the Music button:
In the Music Settings window, make sure the “Play music during slideshow” checkbox is selected.
Do one of the following:
To use one song for the whole slideshow, choose an option from the Source pop-up menu, and then select a song.
To listen to a song, double-click it, or select it and click the Play button. To stop playing the song, click the Play button again.
To create a playlist of several songs, select “Custom Playlist for Slideshow,” and drag songs from the top list to the area below the checkbox. To reorder songs, drag them up or down in the list.
To adjust the slideshow length to the music (or vice versa), see Change slideshow settings.
To prevent slideshow music from playing, deselect “Play music during slideshow” in the Music Settings window.
Tip: If it takes a long time for a slideshow to start, it might be because the background music is a very large file. Try choosing a song with a smaller file size. To see a file’s size, open iTunes, select the song, and then choose File > Get Info.