The PSR2000 doesn't come with songs. It comes with a database of styles that can be played with a certain song. If you select that song in this database, the style will come up in the correct tempo. You could just as easily select the style and adjust the tempo.
I don't think the music finder database adjusts anything besides the tempo, so I never use it gigging. I have only used it to see how the styles sound for familiar songs.
So it's kind of a nice learning tool, but I don't think that it's a necessary database for gigging.
I know there is someone who has developed an Excel program through which you can delete songs from the database, but this person I heard doesn't wish to share it at this time.
Nevertheless, after you pull up the Music Finder, you can assign any familiar song you like to a list of favorites. To pull up the list of favorites, you just press
1. MUSIC FINDER
2. NEXT
Now you can scroll through your favorite songs.

Larry