The only way you can add music to the QT movie file created and exported from iPhoto to iDVD would be to drag that movie file into an iDVD slideshow and add the music there. However, you would have to get the playing time of the movie file and then create a playlist in iTunes with the same playing time and use that playlist.
Slideshows created in iPhoto and exported to iDVD are usualluy saved in the Pictures/iPhoto Slideshow folder.
Or you can import that movie into iMovie and add the music there. If you're familiar with iMovie you'll have more control over the music than with the iDVD slideshow method. Best of all is if you have a copy of iMovie HD 6 which give the the most audio control than the later iMovie versions:
Thanks for the ideas - I think I'll try adding music to an idvd slideshow as I had already fitted the slideshow in iphoto to a few songs so it might work - I found how to add a Slideshow to the project but how do I get the photos from the other part of idvd into it and how do I put the music in - I've tried draging it from itunes but it won't take.
Don't burn it directly from iDVD. Follow this workflow and youi'll avoid making coasters if the encoding doesn't work:
Once you have the project as you want it save it as a disk image via the File ➙ Save as Disk Image menu option. This will separate the encoding process from the burn process.
To check the encoding mount the disk image and launch DVD Player and play it. If it plays OK with DVD Player the encoding was good.
Then burn to disk with Disk Utility or Toast at the slowest speed available (2x-4x) to assure the best burn quality. Always use top quality media: Verbatim, Maxell or Taiyo Yuden DVD-R are the most recommended in these forums.