Ghufran,
See the various databases available for download from this link:
http://psrtutorial.com/sty/OF/musicfinder.html
and the related database viewer/editor program available at this link:
http://psrtutorial.com/MB/musicfinderview.html
Yes ! These files are Yamaha oriented, but if you are going to play "Goodnight, Irene", the recommended rhythm style and tempo would be the same, whether you play it on a Yamaha or a Casio, so you should be able to get at least some use out of them. The only difference is, if you are using a Yamaha keyboard, the database can be loaded into and viewed directly from the keyboard itself. If you do find these useful, under the viewer/editor program's "File" dropdown menu is an option to print the database. Just be aware that most of these databases have in excess of a thousand entries, so the printed output could get a bit lengthy. For my "non-Yamaha" arrangers, I keep a copy of the databases and the viewer/editor program on a small netbook next to the keyboard, and for my "all time, most popular favorites", I just save them under the keyboard's "Registration" feature.
Good luck !