Almost every piece of music on the website is in PDF format. Instrumental packages with multiple parts are combined in a ZIP file.
To open and print PDF files, you need Adobe Acrobat Reader, a free program (https://get.adobe.com/reader/).
Most modern operating systems handle ZIP files like regular system folders, but you might need a program to extract the files. We recommend a free program called 7-Zip (http://download.cnet.com/7-Zip/3000-2250_4-10045185.html)