CASA the Contemporary A Cappella Society of America used to have an
arrangment library of over 1200 songs, It was taken down about 2 years
ago. I need to find a website that has all of the pdf files of the
arrangements on their server for download. I will also accept someone
who has all of the songs or access to the old library who would be
willing to hand over the files to me for free. Good Luck

According to the CASA's website, they once again have a library of
arrangements, although it is now limited to public domain songs and
original compositions because of copyright law. If you were not aware
of this, you might want to take a look at the description of the new
library at the link below. If you are aware, it might be helpful to
clarify that for the researchers, and provide some further specifics
as to what exactly you might need from the old library that is not
available in the new one.

http://www.casa.org/caras/index.php?option=com_content&task=view&id=482&Itemid=150

The new Library only has about 30 public domain songs now. I am
looking for the old archive of about 1500 songs that was taken away
about 2 years ago. Most of the songs in the old library are covers of
popular songs. I am looking for this old archive not the new one that
currently exists.