I save each "registration" as a "song title". Each of these songs are then saved to a folder (Standards, Oldies, Country, Latin, Xmas, Specials, etc...)
I've used this system for my Tyros 1, PSR 3k and now my Tyros 2...and it really seems to be efficient to access songs very quickly. So much so, that I've got proficient in as I'm nearing the end of one song, I'm able to pull up the next "registration/song" I plan to perform. Once the first song completely ends, I hit the appropriate letter button that corresponds to the new song and I begin the next tune.
It allows me to basically keep the dead time in between songs to an absolute minimum, which is pretty important when you're performing for dances of any kind.
Bill in Dayton