Opening more than one song for playback

I'm using Live 9 to create some of the instrument parts for a Jazz Vocal Group.  I'll use Launch Pad to control start and stop in session view.

I'm trying to avoid playing with the computer to wait and load songs

I want to be ale to load up all four songs to switch between them quickly. 

Would I do this by creating each song as a scene.....tempos are different ad sue the scene on command on Launch pad. 

Is there a better way?