Go to the TRANSITIONS tab.
For the first slide you can any transition...
Click on any of the transition types that show up, for example "Curtains".
Then click on each slide, one slide at a time, and add a different transition to each slide.
So your slides timings should be like this:
- First and last slides are just 5 sec.
- List slides are 20 sec.
- Song slides are 10 sec.
Drag each song slide so it's before a list like this...
When you're done, your slides should look like this...