In iPhoto 5, you can associate a specific song or playlist in your music library with an iPhoto photo album. That music will then also be associated with the photo album on iPod photo once you sync it. Here's how to do this.
- In iPhoto, select a photo album in the Source list.
- Click the play button in the window's lower-left corner.
- Click the Music tab and select the music or playlist that you want.
- Click Save Settings.
- Sync your iPod photo in iTunes.