Playing background music with my slide show

I am running MAC OS 10.7.5

I am using iPhoto 6.0.6

I have 60 photos to put into a slide show. Can I use more than 1 audio (MPG3) file as background music (play several songs one after the other) as the slides are played via a slide show that I will then create a movie (.MOV) file so that the music and slide show is one file? Or am I limited to using just one song for all 60 slides?