Larry:
I have never used the playlist on the SX-900. Playlists are a direct link to registrations, so I'm not sure of the advantage of creating playlists, when I already have the exact same setup in my registration list.

Example; I want to keep my FAVORITE LATINS in one place so I can select them easily. Or 50’s music, or polkas, or whatever is important to you.

I hope this helps, John C.
PS, once learned, it is a simple and quick to do.