Can't use Apple Music in iPhoto slide show
I've just made my first slide show in iPhoto and want to set it to music. When I click on the music symbol in the side bar I can see a list of my Apple Music albums but the song titles are in a light font and I can't open or add them to the show.
There are a couple of albums which I've loaded from CDs; their songs will play if I click on them but won't play when I start the slide show.
I must be missing something really obvious here and advice would be appreciated.
Thanks
Mike
iMac, OS X Mavericks (10.9)
