To view the pdfs with Google Viewer click on view
To view the pdfs in Adobe Acrobat, click on download and open with Acrobat
To save a pdf with Adobe Acrobat, click on download and then save
To print a score it is best to open in Acrobat and print from there (ie not in Google Viewer)
To hear a midi file, click on download and then open
To save a midi file, click on download and then save